[单选题]
The gravitational force be+lm8/o mcrshs ;,n;.ra f.pmag. m,s:htg y*xtwees.2 l:ax7j ufdn two objects is proportional to
A. the distance between the two objects.
B. the square of the distance between the two objects.
C. the product of the two objects.
D. the square of the product of the two objects.
