The correct answer is C. Confidentiality. In information security, the CIA triad consists of Confidentiality, Integrity, and Availability. Confidentiality specifically addresses the secrecy and privacy of information by ensuring that sensitive data is accessed, viewed, or disclosed only by authorized individuals, systems, or processes. CEH-aligned material explains that confidentiality means information is secret and should not be disclosed to unintended people or entities; if confidentiality is compromised, it can cause unauthorized access and privacy loss. Another CEH exam guide source states that confidentiality addresses the secrecy and privacy of information and prevents disclosure to unauthorized individuals or systems. Availability is incorrect because it ensures systems and data are accessible when needed. Integrity is incorrect because it protects data from unauthorized modification. Authentication is also incorrect because it verifies identity, but it does not itself define secrecy or privacy. Therefore, the best CEH answer is Confidentiality.