According to the ServiceNow Hardware Asset Management documents, the role that allows you to allocate a resource is the resource_manager role1.
The resource_manager role is a role that grants the user the ability to manage resources, such as hardware assets, consumables, and stockrooms, and to perform tasks related to resource allocation, reservation, transfer, and audit1.
The other roles that are not the correct answer are:
A: resource_user: This is a role that grants the user the ability to view and request resources, such as hardware assets and consumables, from the service catalog or the mobile app2.
B: it_project_user: This is a role that grants the user the ability to view and participate in IT projects, such as hardware asset refresh projects, and to track the progress, costs, and risks of the projects3.
C: business_stakeholder: This is a role that grants the user the ability to view and provide feedback on the business services and outcomes that are supported by the IT assets and resources4. References:
1: Resource Manager Role
2: Resource User Role
3: IT Project User Role
4: Business Stakeholder Role

A field service management (FSM) change task is a task that is created from a change request and assigned to a field service agent to perform work on a configuration item (CI) or an asset1.
An asset task is a task that is created from an asset record and linked to an FSM change task to track the work done on the asset2.
When an asset task is completed, the asset record associated to the task is automatically updated with the latest information, such as location, status, assignment group, assigned to, and so on2.
This feature removes the need to manually update the asset record after completing the FSM change task, saving time and ensuring accuracy2.

According to the ServiceNow Product Documentation on Transfer Orders1, transfer orders are records that define the movement of assets from one stockroom to another1. They can be used to replenish the stock of assets, fulfill asset requests, or relocate assets1.
According to the ServiceNow Product Documentation on Transfer Order Line Tasks2, transfer order line tasks are records that define the actions that need to be performed for each transfer order line2. A transfer order line is a record that defines the quantity and model of the assets that are being transferred1.
The main purposes of transfer order line tasks are2:
To help track service levels and the time frame needed to complete a transfer order: Transfer order line tasks have a due date and a state that indicate the progress and completion of the transfer order line. They also have a priority and an assignment group that determine the urgency and the responsibility of the transfer order line. These fields help users to monitor and manage the service levels and the time frame needed to complete a transfer order.
To move transfer order lines from one stage to another: Transfer order line tasks have a type that defines the action that needs to be performed for the transfer order line, such as pick, pack, ship, or receive. As transfer order line tasks are completed, the transfer order line moves from one stage to another, such as requested, in transit, or received. These stages reflect the status and location of the assets that are being transferred.
Reference:
1: ServiceNow Product Documentation: Transfer Orders
2: ServiceNow Product Documentation: Transfer Order Line Tasks

To activate HAM, navigate to System Definition > Plugins and search for Hardware Asset Management. Click Activate/Upgrade and follow the instructions1.
To run the scheduled job "Asset - Create FSM asset tasks", navigate to System Definition > Scheduled Jobs and search for the job name. Click Execute Now to run the job immediately or set a schedule for it to run periodically2.
The scheduled job will create asset tasks for existing incidents, changes, and work orders that have assets associated with them. The asset tasks will be linked to the parent records and will have the same state and assignment group as the parent records2.
The asset tasks will allow the asset managers to track and manage the assets involved in the service delivery processes3. References:
1: Hardware Asset Management - ServiceNow
2: Asset - Create FSM asset tasks scheduled job
3: Hardware Asset Management and Field Service Management integration