Explanation:

🟢 A. QuoteGroup
QuoteGroup is the out-of-the-box custom object designed to represent sub-deals or line-level deal groups in Media Cloud and Salesforce Industries CPQ.
It allows tracking of specific details for each sub-deal, such as amounts, dates, and other relevant financial or timing attributes.
It essentially helps segment the main deal or quote into multiple logical components (sub-deals) for reporting and management purposes.

❌ Incorrect Options

🔴 B. QuotePricingAdjustment
Represents discounts, markups, or adjustments applied to a quote or quote line item.
Not used to track sub-deal structures themselves.

🔴 C. QuoteMember
Typically relates to members associated with the quote, often representing individuals or accounts involved in the quoting process.
Does not represent financial sub-deals or their transactional details.

🔴 D. QuoteProductRollup
Used for aggregating product-level information within a quote, such as totals for related line items.
Not intended to represent distinct sub-deals.

📚 Reference
Salesforce Industries CPQ Data Model Guide
Salesforce Media Cloud CPQ Documentation