Your favorite bowling ball is at rest on the ground. Two other bowling balls are located one due south and the second due west of your favorite ball and they exert gravitational forces of magnitudes 3F amd 4F, respectively, on your favorite ball. The magnitude of the net force that the two other bowling balls exert on your favorite bowling ball is:
A. 7F
B. 3.5F
C. 6F
D. 1F
E. 5F