Marta and Joan brought home a rescue puppy last month, but they did not know how to care for an animal.
The pronoun "they" is used in the sentence as "they" denotes two or more than two people. "They" is used for two or more stated previously or clearly distinguishable individuals or things. In the sentence, Marta and Joan are two different people, thus they are referred to as "they" in the sentence.
"She" pronoun cannot be used for both Marta and Joan collectively as the pronoun "she" is used with a singular female who is only Marta and not Joan.
Thus, the correct option is B.
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