What was the effect of discovering oil at spindletop

Question

A. The state suffered economically because the supply wasn't as much aas people expected.
B. The supply at spindletop was not enough to economically support the exploration of nearby sources for oil.
C. The U.S became the leading producer of oil in the world for a time.
D. The U.S was finally able to compete along with the other top oil producers in the world.
I think the answer is D or C

Answer 1

So which one? D or C?

Answer 2

Right

Answer 3

This really helped me whith my daughters homework