The Birthrate in the United States

The birthrate in the United States

A) has been almost constant for the last thirty years.
B) is falling again because many couples born during the "baby boom" are now past their child-bearing years.
C) rose when Vietnam vets got married, had children, and created the "baby boom" generation.
D) will contribute more to U.S. population growth than immigration in the next 25 years.
E) All of the above are true.