Suppose We Could Magically Triple the Distance Between Earth and the Moon

Multiple Choice

Suppose we could magically triple the distance between Earth and the moon. This would cause the gravitational force by Earth on the moon to be

A) reduced to 1/9 of its former value.
B) reduced to 1/4 of its former value.
C) increased to three times its former value.
D) be unchanged.
E) reduced to 1/3 of its former value.