The moon is roughly one-sixth the size of the earth. Which statement is true?

a. The gravitational pull of the moon is greater than the earth because it is larger than earth.

b. The gravitational pull of the moon is less than the earth because it is smaller.

c. There is no gravitational pull on the surface of the moon.

d. The gravitation pull of the moon is the same as the earth because they are both spheres.