Which legislation prohibits a financial institution from disclosing a consumer's nonpublic personal information without notice?

The Gramm-Leach-Bliley Act (GLBA) is the correct choice because it specifically addresses the protection of consumers' nonpublic personal information held by financial institutions. This legislation requires these institutions to provide clear privacy notices to consumers about their information-sharing practices and gives consumers the right to opt-out of certain information sharing with non-affiliated third parties. The GLBA emphasizes the importance of safeguarding personal financial information and establishes guidelines for how financial institutions must handle and disclose this sensitive information.

The other options focus on different areas of regulation: the McCarran-Ferguson Act primarily concerns the regulation of insurance companies and their ability to engage in anti-competitive practices; the Federal Trade Commission Act deals with unfair or deceptive business practices in various sectors, but it does not focus specifically on financial institutions and consumer privacy; and HIPAA is focused on the protection of health information, particularly in the healthcare sector, rather than financial information.