According to the ServiceNow Hardware Asset Management documentation, assets can be moved between stockrooms by using transfer orders. A transfer order is a record that tracks the movement of assets from one stockroom to another. A transfer order can be created manually by the stock manager or automatically by the system based on predefined rules or workflows1. A transfer order contains information such as the source and destination stockrooms, the assets to be transferred, the shipment details, and the status of the transfer2.
The other options are not correct because:
Stock orders are records that track the procurement of assets from vendors, not the movement of assets between stockrooms3.
Stock rules are rules that define the minimum and maximum stock levels for each asset model in a stockroom, not the movement of assets between stockrooms.
Transfer rules are rules that define the conditions and actions for creating transfer orders automatically, not the records that track the movement of assets between stockrooms.
Reference:
ServiceNow Hardware Asset Management: Transfer orders
ServiceNow Hardware Asset Management: Create a transfer order
ServiceNow Hardware Asset Management: Stock orders
[ServiceNow Hardware Asset Management: Stock rules]
[ServiceNow Hardware Asset Management: Transfer rules]

According to the Hardware Asset Management page, the three tiers of Lifecycle Management are:
Know what you have: This tier involves tracking and managing the end-to-end lifecycle of all your hardware assets, physical and consumable, on a single system of action.
Improve management controls: This tier involves aligning hardware investments to business outcomes, and quickly identifying and mitigating technology risks such as tech debt, regulatory audits, and lost assets.
Improve efficiency: This tier involves improving efficiencies and simplifying every stage of the asset lifecycle with prescriptive workflows and tasks, normalizing hardware to maintain a clean CMDB, and getting actionable insights to minimize waste and strategize for asset refreshes.
These three tiers correspond to the options C, D, and E in the question.
The options A and B are not part of the Lifecycle Management framework, and are not mentioned in the ServiceNow Hardware Asset Management documents. Reference:
Hardware Asset Management
What is Hardware Asset Management?
Your asset lifecycle: How to manage it all

To exclude certain types of CIs from the CI lists on the Incident, Problem, and Change forms, you can use the Principal CI class checkbox, which is available on the Class Manager module under Configuration1.
The Principal CI class checkbox allows you to specify which CI classes are considered as principal CIs, meaning they are the most relevant and important CIs for the business services and processes1. By default, only the CI classes that have this checkbox selected are displayed on the CI lists on the Incident, Problem, and Change forms2.
To use this feature, you need to navigate to the Class Manager module, select the CI class that you want to exclude or include, and check or uncheck the Principal CI class checkbox accordingly1. You can also use the Filter option to search for the CI classes by name or label1.
The other options are not recommended or valid ways to exclude certain types of CIs from the CI lists. Adding a Show field to the base cmdb table would require modifying the table schema and creating a reference qualifier, which could affect the performance and integrity of the CMDB3. Creating an Access control to hide the unnecessary CIs from the itil users would require defining the conditions and roles for the access rule, which could be complex and error-prone4. Making a show/hide UI action to show only the desired CIs to the itil users would require creating a custom script and UI element, which could be incompatible with the existing UI and functionality. References: 1: Principal configuration item classes 2: Configuration item lists 3: CMDB table schema 4: Access control rules : [UI actions]

Explanation
The ServiceNow Mobile App is a native app that enables users to access various ServiceNow features and functions from their mobile devices12.
One of the features of the ServiceNow Mobile App is to provide end users visibility to their assigned hardware. This means that end users can view and report issues around their assets, such as laptops, tablets, or phones, from the app34.
Another feature of the ServiceNow Mobile App is to enable end users to log incidents for their assigned assets. This means that end users can create and update incidents related to their assets, such as hardware failures, software errors, or network problems, from the app34.
The other options are not features of the ServiceNow Mobile App. The app does not enable reclamation of mobile devices, which is a process of recovering and reusing devices that are no longer needed or used. The app also does not provide users visibility to their disposed consumables, which are items that are used up or depleted over time, such as toner cartridges, batteries, or paper.
References:
1: ServiceNow Product Documentation: ServiceNow Mobile Apps
2: ServiceNow Product Page: Now Mobile - Now Platform
3: ServiceNow Product Documentation: Now Mobile App
4: ServiceNow Product Documentation: Mobile Agent App
[5]: ServiceNow Product Documentation: Reclamation
[6]: ServiceNow Product Documentation: Consumables