In $\mathbf { F } ( t ) = - \frac { \operatorname { GmM } \mathbf { r } ( t ) } { \| \mathbf { r } ( t ) \| ^ { 3 } }$

Multiple Choice

In $\mathbf { F } ( t ) = - \frac { \operatorname { GmM } \mathbf { r } ( t ) } { \| \mathbf { r } ( t ) \| ^ { 3 } }$ , r represents

A) The radius of the sun
B) The radius of the planet around the sun
C) The distance function between the planet and the sun
D) The position function of the sun
E) The position function of the planet about the sun