Which part of the sentence is the nonrestrictive modifier?

likes history and geography the best

and geography the best

who enjoys many different subjects

Marlena

The part of the sentence that is the nonrestrictive modifier is who enjoys many different subjects.

A nonrestrictive modifier is a part of a sentence that provides additional details about the subject, but if we remove it, the sentence won't lose any of its meaning - nonrestrictive modifier is not essential.