These four monkeys always quarrel . . . . . . . . themselves in cage. A. on B. in C. among D. between

The correct answer is C. among.

The preposition “among” is used to refer to a group of people or things that are considered to be separate from each other. In this case, the four monkeys are considered to be separate individuals, and they are quarreling with each other.

The preposition “on” is used to refer to a surface or location. In this case, the monkeys are not quarreling on a surface, but rather they are quarreling with each other.

The preposition “in” is used to refer to a container or enclosure. In this case, the monkeys are quarreling in a cage, but they are not quarreling with the cage itself.

The preposition “between” is used to refer to the space that separates two or more things. In this case, the monkeys are quarreling between themselves, but they are not quarreling with the space between them.