The correct answer is D) big business.
The other options of the question were A) immigrants. B) labor unions. C) nativists.
The group that benefited most from the policies of President Calvin Coolidge was big business.
President Calvin Coolidge (1872-1933) ruled the country during those great prosperity years called "the Roaring 1920s." As the 30th President of the United States, he allowed minimum economic regulation and people had the money to buy houses, cars, furniture and more, on credit. President Coolidge was a conservative Republican that supported tax cuts to help companies and heavily supported big business.