Final answer:
The true statement is C) CORs are responsible for ensuring personnel accountability, where they ensure the contractor complies with contract terms and manage various aspects of performance.
Step-by-step explanation:
The statement that is true about COR responsibility during the accountability process is C) CORs are responsible for ensuring personnel accountability. Contracting Officer's Representatives (CORs) play a critical role in the contract management process. They serve as the eyes and ears for the contracting officer and are accountable for various aspects of contract performance, which include monitoring the contractor's compliance with contract terms, performance schedules, as well as ensuring proper personnel accountability. Although personnel accountability is a key responsibility, it is part of a broader set of COR duties that may also involve cost control, quality assurance, and other project management tasks.