Answer:
Your answer would be B.
Step-by-step explanation:
An appositive is a noun or noun phrase that renames another noun right beside. In the sentence above (b), the appositive phrase is a nurse in a busy hospital and it renames the noun phrase my Aunt Meena.
Nonessential appositive phrases are always offset with commas from the rest of the sentence. This is so because the information they provide is not considered essential to complete the meaning of the sentence. If they were dropped (1), the meaning of the sentence would be left unchanged. Apparently, the speaker believes that stating his/her aunt's birthplace is more relevant that her job (being a nurse in a busy hospital).
1) My Aunt Meena is from California