Kangaroos, . . . . . . . . use their pouch to carry their babies, are found in Australia.

Solution (By Examveda Team)

The correct answer is Option D: which.

First, let's define the relative pronouns in the options.

Whom: A relative pronoun used for referring to people as the *object* of a verb or preposition.
Whose: A relative pronoun showing possession (belonging to someone or something).
Who: A relative pronoun used for referring to people as the *subject* of a verb.
Which: A relative pronoun used for referring to things, animals, or groups of people.

The sentence refers to kangaroos, which are animals. The clause "use their pouch to carry their babies" acts as a descriptive clause modifying "kangaroos." In this clause, "kangaroos" is the subject performing the action of using the pouch. Therefore, we need a relative pronoun that refers to animals and acts as a subject. "Which" fits this description perfectly.

Why other options are incorrect:

Option A (whom): Incorrect because "whom" is used for objects, not subjects. The kangaroos are the subject of the verb "use."
Option B (whose): Incorrect because "whose" indicates possession. The sentence doesn't describe anything belonging to the kangaroos in this clause.
Option C (who): Incorrect because "who" refers to people, not animals.