What was the consequence of the formation of the Standard Oil Trust?

What was the consequence of the formation of the Standard Oil Trust?

a. The federal government passed legislation to stop further trusts from forming.
b. Other industries followed its lead, and trusts became common in America.
c. John D. Rockefeller lost control of his company.
d. Other oil companies began to compete with Standard Oil over prices.
e. It became famous as the only trust ever formed in the United States.

ANSWER
B