The primary purpose of a Certificate of Confidentiality is to: a. Protect identifiable research information from compelled disclosure. b. Prevent subjects from knowing the purpose of a study. c. Protect researchers from disclosing conflicts of interest. d. Allow law enforcement to investigate abuse cases.

The answer is a. Protect identifiable research information from compelled disclosure.

Explanation:

The primary purpose of the Certificate of Confidentiality (CoC) is to protect investigators or researchers from being compelled or forced to reveal the identity of their research work, or confidential information generated from their practice.