Answer: The answer to your question would be that the version of the sentence that has correctly placed commas is the following one: Ming and her sister, who is home from college for spring break, organized a bake sale to benefit the victims of the fire. That is, the correct option would be C.
Step-by-step explanation:
This is a nonessential relative clause. This means that the information provided by the clause is not necessary to identify the noun it modifies. In fact, the clause could be dropped without altering the meaning of the sentence (see 1). Because the clause is nonessential, it should be separated from the rest of the sentece by means of the commas.
1) Ming and her sister organized a bake sale to benefit the victims of the fire