Question

1. which sentence contains a nonrestrictive parenthetical expression?

a. the student who won the award thanked her teacher.
b. the book that you lent me was fascinating.
c. jeremy loves to buy antique books (which is probably why he has no money).

Explanation:

A nonrestrictive parenthetical expression adds extra, non-essential information that can be removed without changing the core meaning of the main sentence. Options A and B use restrictive clauses ("who won the award," "that you lent me") that are necessary to identify the specific student/book. Option C's parenthetical clause in parentheses provides additional commentary that is not required to understand the main statement about Jeremy's hobby.

Answer:

C. Jeremy loves to buy antique books (which is probably why he has no money).