Which organization is primarily responsible for investigating unfair or deceptive acts in privacy protection?

The Federal Trade Commission (FTC) is primarily responsible for investigating unfair or deceptive acts in the realm of privacy protection. The FTC’s role includes enforcing privacy regulations and taking action against businesses that engage in misleading practices regarding the collection and use of personal data. This authority allows the FTC to protect consumers and maintain fair competition in the marketplace by ensuring that companies adhere to their own privacy policies and the standards set by law.

In contrast, other organizations like the Commodity Futures Trading Commission (CFTC) focus on futures and options markets, the Consumer Financial Protection Bureau (CFPB) specifically oversees consumer financial products and services, and the Department of Health and Human Services (HHS) manages regulations around health information privacy through HIPAA. None of these entities have the broad enforcement role regarding privacy practices that the FTC possesses. Thus, the FTC's mission aligns closely with addressing unfair or deceptive acts related to personal data, making it the correct answer.