For migrating an install base to Revenue Cloud with focus on Amendments and Renewals, the correct objects are Asset, Asset Action, Asset State Period, and Asset Action Source. These objects form the foundation of Revenue Cloud's Asset Lifecycle Management, which is essential for tracking customer subscriptions and enabling amendment and renewal processes.

The Asset object represents products or services that customers have purchased and own. It contains critical information about what the customer has, including quantity, pricing, and contract relationships. The Asset Action object tracks all changes made to assets throughout their lifecycle, including new purchases, amendments, renewals, and cancellations. Each asset action creates a historical record of modifications.

Asset State Period is crucial as it represents time spans when an asset has the same quantity, amount, and monthly recurring revenue (MRR). According to the Revenue Cloud Developer Guide, "An asset has as many asset state periods as there are changes to it (asset actions) during its lifecycle." This object is essential for accurate revenue recognition and reporting.

Asset Action Source links back to the originating transaction (Quote or Order) that created or modified the asset, maintaining data lineage. This traceability is vital for amendments and renewals, as Revenue Cloud needs to understand the complete history of each asset.

Option B includes legacy CPQ objects (Subscription, Subscribed Asset) that are not part of Revenue Cloud's asset management model. Option C focuses on transactional objects rather than asset tracking. The Asset Lifecycle Management objects in Option A are specifically designed to support the amendment and renewal workflows that are critical to the customer's business requirements.