Two Balls Have the Same Weight and Surface Texture, but One

Multiple Choice

Two balls have the same weight and surface texture, but one has twice the diameter of the other. How many times larger is the terminal speed of the smaller ball falling through air than that of the bigger ball?

A) The balls fall with the same speed in air.
B) The smaller ball's terminal speed is $[2]^{1 / 2}$ times larger than the other's.
C) The smaller ball's terminal speed is 2 times larger than the other's.
D) The smaller ball's terminal speed is 4 times larger than the other's.
E) The smaller ball's terminal speed is some other multiple of the other's (specify) .