Final answer:
Andrew Mellon served as the Secretary of Commerce under Harding.
Step-by-step explanation:
Under President Warren G. Harding, the Secretary of Commerce was Herbert Hoover. Herbert Hoover served as the 31st Secretary of Commerce from March 5, 1921, to August 21, 1928. Hoover later went on to become the 31st President of the United States, serving from 1929 to 1933. Prior to his political career, Hoover had gained recognition for his humanitarian efforts, particularly as the head of the American Relief Administration, where he played a significant role in providing food relief to war-torn Europe after World War I.
The correct answer is D) Andrew Mellon. Andrew Mellon served as the Secretary of Commerce under Harding. He was a pro-business multimillionaire with a background in banking and aluminum. Mellon believed that the government should be run efficiently, like a business, and he advocated for low taxes for corporations and the wealthy.