Option D would involve discussing a strategy between the source org and target org Sales teams on the criteria of Leads to migrate from the source org to the target org, and migrating Leads to the target org after they are enriched in the source org. This would allow both Salesforce orgs to remain independent from each other, while also enabling UC to use all Leads from one of the acquired Salesforce orgs for its new targeted campaign. This would also preserve the value of Lead enrichment that happens in the source org via third-party marketing tool.
https://trailhead.salesforce.com/credentials/b2bsolutionarchitect

A RACI matrix is a tool that defines the roles and responsibilities of different stakeholders in a project or process1.
The RACI matrix has four categories: Responsible, Accountable, Consulted, and Informed12.
Responsible means that the stakeholder is directly involved in performing a task or making a decision12.
Accountable means that the stakeholder has ultimate authority and accountability for a task or decision12.
Consulted means that the stakeholder provides input or feedback on a task or decision12.
Informed means that the stakeholder is kept updated on the progress or outcome of a task or decision12.

Review the established and planned dataflows to understand where the systems of record sit and where data is transported to already. This is an important step to assess the current state of data integration and identify any gaps or challenges that might affect the reporting solution.
Identify key drivers and high-level data scope behind the need for a consolidated reporting. This is an essential step to understand the business requirements and expectations for the reporting solution, as well as the key metrics and KPIs that need to be measured and reported on.
Review the system landscape to identify other existing solutions for reporting and start to investigate high-level cost impacts (incl. licenses aspects) for the most viable. This is a useful step to explore the possible options for delivering a consolidated reporting solution, such as using existing tools or platforms, building a custom solution, or leveraging third-party solutions. It also helps to estimate the costs and benefits of each option.

a Sales Cloud license is suitable for users who need full access to standard CRM and Force.com AppExchange apps. The CEO should have this type of license since they are a processor of information and need to review the Executive Dashboard.
a role hierarchy is a mechanism to control the data access to the records on a Salesforce object based on the job role of a user. Users can access the data of all the users directly below them in the hierarchy. Therefore, the role hierarchy should mirror the organization chart, and sharing settings need to be put in place for the executive assistant who reports to all of the VPs.
https://www.salesforce.com/resources/guides/salesforce-user-management-guide/

it is important to set up the product and pricing structure in CPQ correctly and align it with the business requirements and expectations. This can affect how products are configured, quoted, priced, and ordered in CPQ and Billing, as well as how they are integrated with ERP for order fulfillment12. Getting feedback on this area early can help avoid rework or errors later.
https://help.salesforce.com/s/articleView?id=blng_overview.htm&language=en_US&type=5