Question

earth is not a perfect circle. due to the ______ gravitational pull, earth bulges out on the sides closest to and farthest from the moon. this distorting pull is known as a tidal force, and it is responsible for the changes in water levels that are called high and low tides.
which choice completes the text so that it conforms to the conventions of standard english?
choose 1 answer:
a moons
b moons
c moons
d moon

Explanation:

In English, to show possession (here, the gravitational pull belongs to the Moon), we use the possessive form. For a singular noun like "Moon", the possessive is formed by adding an apostrophe and an "s" ('s). "Moons" is plural (not relevant as there is one Moon). "Moons'" is the plural possessive. "Moon" is just the noun without showing possession.

Answer:

C. Moon's