[单选题]
Ball A is dropped fr ao3w(tbe +z( 0ueeh/(y+j vddom t2or4t6 rzsqmsx )ed; )he top of a building. One second later, ball B is dropped from the same building. As time progresse x)rq r;6es2m)zs4dots, the distance between them
A. increases.
B. remains constant.
C. decreases.
D. cannot be determined from the information given.
