【正确答案】 A

【答案解析】 Rhetorical Construction; Agreement
   The subject of the sentence is the 32 species that make up the dolphin family, and the sentence makes two claims about them: They are closely related, and they include the killer whale. The relative pronoun which restates the object of the second verb, reintroducing the animal known as the killer whale as the subject of a relative clause followed by two parallel verbs: can grow and is famous.
   A   Correct. In this concise sentence, verbs agree in number with their subjects and the relative pronoun which indicates clearly that the animal known as the killer whale is the subject of the verbs in the dependent clause.
   B   Changing the verb to the participial growing introduces ambiguity, because it could refer back to the subject of the sentence (32 species).
   C   The participial growing might refer to the 32 species; the introduction of being is unnecessarily wordy and adds nothing in terms of meaning.
   D   as big as is an idiomatically incorrect expression of the comparison; the plural verb form include is needed to match the plural subject the 32 species.
   E   It simply restates the subject of the previous phrase, introducing more words but no additional meaning; the singular verb form includes should be the plural form include.
   The correct answer is A.