What happened to the population of Breckenridge, Texas?
A. The population increased from 750 to 7,500 after the boom was over.
B. The population decreased from 30,000 to 7,500 after the boom was over.
C. The population increased from 7,500 to 30,000 after the boom was over.
D. The population remained about the same after the boom was over.