16. An observer A stands on the ground with clock CA and an observer B sits on an airplane with clock CB. The airplane moves with a velocity v with respect to the ground. Consider the relativistic time dilation effect, which one of the following descriptions is correct? (A) The observer A finds that Cₐ counts faster than CB, but the observer B finds that CB counts faster than CA. (B) The observer A finds that CA counts slower than CB, but the observer B finds that CB counts slower than CA. (C) Both A and B find that CA counts faster than CB. (D) Both A and B find that CA counts slower than CB. (E) Both A and B find that CA counts as fast as CB.