Which statement about John D. Rockefeller and J.P Morgan is accurate?

AThey were the leading Republican contenders in the 1916 presidential campaign.

BThey were railroad tycoons who collaborated to build the transcontinental railroad.

CThey were two of the richest, most powerful men in America during the Gilded Age.

DThey were muckraking journalists who exposed corruption in monopolies and trusts.