$1)$ Two objects are dropped from a bridge, an interval of $1\mathrm{.}0$ s apart. Air resistance is negligible. During the time that both objects are falling, their separation:

A$)$ increases.

B$)$ decreases.

C$)$ stays constant.

D$)$ increases at first, but then stays constant.

E$)$ decreases at first, but then stays constant.