Please answer quickly its a test and i need to get a good grade on it, will give brainliest What was an important impact of the Louisiana Purchase?

A. The land size of the United States was doubled and vast new resources were acquired.

B. The United States was pushed into a long, costly war with the Indian tribes in the territory.

C. The United States became a major world power rivaling Great Britain in wealth and influence.

D. The people of the United States began an immediate land rush into the territory to form new states.