Need with english.

the thesis statement of your research report
a.can be a question or an answer, either one
b. is always a question
c. is never a question. rather, it is the answer to a research question

The answer should be C you never want a question in a thesis statement

Option C.

Explanation:

First of all, if it were a question, it would not be a thesis statement. Thesis statements tell the audience what your piece will be about.

It is relative easy to spot a nonrestrictive clause - it is usually set off from the rest of the sentence by commas. Nonrestrictive means that it is not essential for the sentence, which also means that if it were omitted from the sentence, the sentence would still make perfect sense. 
Having this in mind, the correct answer is - The old apron, which belonged to Mama, is torn.