Statement A because I just took the test
Susie's mom bought her SOMETHING at the grocery store.
Vague nouns are unspecific things that don't tell you exactly what something is!
More examples of vague nouns: something, things, stuff, etc.
Parallel structure is the use of the same grammatical structure in a text: the correct answer is A. It does not matter then whether this structure has articles, complex phrases or adverb-verbs, as long as the structure of two or more sentences is the same!
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