What in Part Explains the High Population Growth Rate in Texas

What in part explains the high population growth rate in Texas?

A) in-migration from other states and a higher than average death rate
B) a higher birth rate than other states and in-migration from other states
C) an unusually high per capita income and the lack of labor unions
D) a higher birth rate than other states and expanded employment opportunities in medicine and biotechnology
E) reduced medical malpractice awards and a higher birth rate than other states