Final Answer:
The Government Accountability Office (GAO) assists Congress in oversight of the executive branch and establishes some governmental audit standards. Option A is the answer.
Step-by-step explanation:
The correct option is A. The Government Accountability Office (GAO) is an independent agency that works for Congress and supports it in overseeing the executive branch. GAO performs audits, investigations, and evaluations of government programs and activities to ensure accountability and efficiency. Its role is vital in providing Congress with the necessary information to make informed decisions and hold the executive branch accountable. The other options—Internal Revenue Service (IRS), Federal Reserve System, and Securities and Exchange Commission (SEC)—have different mandates and functions, primarily related to taxation, monetary policy, and financial market regulation, respectively.
Option A is the answer.