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

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.