Answer: C) Elizabeth bought all the ingredients and then prepared the meal for her grandmother's 90th birthday.
Step-by-step explanation: Parallelism is a literary device that consists in the repetition of the grammatical structures of words or phrases in a sentence or paragraph. From the given options, the correct one is the one that uses parallelism, this is the sentence corresponding to option C, because, as we can see, the two verbs in the sentence are in the same form (both are in past tense): Elizabeth bought all the ingredients and then prepared the meal for her grandmother's 90th birthday.