C is the strongest answer because proprietary deployment can give an organization greater control over system architecture, permissions, agent behavior, data access, escalation rules, and technical guardrails. This control is especially valuable for agentic AI, where systems may autonomously invoke tools, access organizational data, and execute multistep workflows. IAPP guidance emphasizes that agentic systems require purpose-specific guardrails, including controls limiting the data and actions available to an agent. Proprietary control can therefore enable safeguards to be tailored closely to organizational risk tolerances and business requirements. It does not provide immunity from intellectual-property claims, eliminating A. Organizations cannot simply transfer accountability or all risk to a cloud provider, eliminating B. Greater agent autonomy actually increases the importance of internal governance, monitoring, authorization, and human oversight rather than reducing it, eliminating D.

================