Answer:
D) The old apron, which belonged to mama, is torn.
Step-by-step explanation:
A nonrestrictive clause described a noun in a nonessential way, it can be removed from a sentence and the sentence´s meaning remain the same. It is a type of relative clauses along with restrictive clauses because the information provided relates to the subject of another clause.
Nonrestrictive clauses give additional but optional descriptions that can be removed from the sentence.
In this case, the nonrestrictive clause is "which belonged to mama". If that clause is removed, the sentence would remain with the same meaning.
I hope this answer helps you.