What Is Expected to Happen to Old-Age Dependency Ratios in the United

What is expected to happen to old-age dependency ratios in the United States?

A) As the population ages, the old-age dependency ratio is expected to rise.
B) The old-age dependency ratio is expected to fall as workers become more productive with better technology in the future.
C) The old-age dependency ratio is expected to stay about the same over the next half-century, as increases in technology and the aging of the population counterbalance one another.
D) Since we do not know when people will retire and how long they will live, it is impossible to estimate what will happen to the old-age dependency ratio over time.