What was the effect of discovering oil at spindletop

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

This really helped me whith my daughters homework

So which one? D or C?

Right

The correct answer is C. The discovery of oil at Spindletop had a significant impact on the United States, particularly Texas. The vast oil reserves found at Spindletop in 1901 transformed the United States into the leading producer of oil in the world for a time. The massive production at Spindletop sparked an oil boom in Texas, leading to an influx of investment, infrastructure development, and population growth. The discovery also had far-reaching effects on the economy, politics, and culture of Texas, and it positioned the United States as a major player in the global oil industry.