The best and most correct answer among the choices provided by your question is the first choice or letter A, which states "the process by which Congress reviews the actions of governmental departments and agencies."
Congressional oversight refers to oversight by the United States Congress on the Executive Branch, including the numerous U.S. federal agencies. Congressional oversight refers to the review, monitoring, and supervision of federal agencies, programs, activities, and policy implementation.
I hope my answer has come to your help. Thank you for posting your question here in Brainly.