Respuesta :
The answer is:
B) Standard Oil.
John D. Rockefeller, who is considered the wealthiest american of all time, was a bussines man that founded the Standar Oil Company in 1870, he mainly did refining of oils and at his peak he would ocntrol 90% of all oil trading in the United States, he stoped running the company in 1897, by the time the Standard Oil company was dismantled by the government due to anti-trust actions, breaking the federal law, the Net worth of Rockefeller amounted to 2% of the National Economy.