When they were ﬁrst discovered in Australia in 1798, duck-billed, beaver-tailed platypuses so deﬁed categorization that one
scientist assigned them the name Ornithorhynchus paradoxus: “paradoxical bird-snout.” The animal, which lays eggs but also
nurses ______ young with milk, has since been classiﬁed as belonging to the monotremes group.
they’re
their
its
it’s
Choice C is the best answer. The singular possessive pronoun "its" agrees with the singular antecedent "the animal" and
indicates that the "young" belong to it.
Choice A is incorrect. This choice creates a pronoun-antecedent agreement error. "They’re" is a contraction of "they are," a
plural pronoun and verb, but the antecedent "the animal" is singular. Also, we don’t need the extra verb "are" — we already
have a main verb in this clause, so adding "are" would be confusing and ungrammatical. Choice B is incorrect. This choice
creates a pronoun-antecedent agreement error. "Their" is a plural pronoun, but the subject of the sentence is "the animal," a
singular noun. Choice D is incorrect. This choice creates a confusing and ungrammatical sentence. "It’s" is a contraction for
"it is." We already have the verb "nurses" in this clause, so we shouldn’t add the verb "is."