We’re performing a scene from my favorite book (the second in the trilogy).

which best explains the writer’s use of punctuation in the sentence?
a) the writer correctly uses parentheses to de-emphasize a nonrestrictive element in the sentence.
b) the writer incorrectly uses parentheses to emphasize a restrictive element in the sentence.
c) the writer incorrectly uses parentheses to set off a restrictive element in the sentence.
d) the writer correctly uses parentheses to modify a nonrestrictive element in the sentence.