Asha is in an isolating box that lets no light our sound in from the outside. Fortunately, she has a battery$-$powered electric light, a ball, and a stopwatch. She drops the ball from rest, and it accelerates towards the floor of the box with $-\frac{g}{2}=-4\mathrm{.}9\frac{m}{s^2}.$ Where is this box located?

A$.$ Attached to a pulley system, accelerating towards the Earth's surface at $-\frac{g}{2}.$

B$.$ On the surface of a planet with the same size as the Earth but half it's mass.

C$.$ In space, far from any planet, accelerating with $+\frac{g}{2}$ towards the box's ceiling.

D$.$ All of the above are possible.