[单选题]
Ball A is dropped from the top of a buizmo7 nu79-uhl0anqh4e9n+i 4zr e1e -2wmhwrlding. One second 1-y8imuv an) ulater, ball B is dropped from the same building. As time progresses, the distance between thevanu8-m )1uyim
A. increases.
B. remains constant.
C. decreases.
D. cannot be determined from the information given.
