I NEED ANSWER ASAP
What was an effect of the California Gold Rush in 1849?

A: Many people discovered gold, became rich, and established multiple mining towns in California.
B: The president authorized the forced removal of the Sioux tribes in California where gold was discovered.
C: An influx of settlers from the U.S. and the world led to the growth of numerous cities in the West.
D: Conflicts between U.S. settlers and foreign miners from China and Europe resulted in military action.