Which sentence contains a restrictive phrase?

madeline (the neighbor’s cat) was sleeping peacefully in the sun.
the novelist—my favorite by far—was kindly autographing books.
jonah, the fastest runner on the track team, injured his left ankle.
the window in the living room provides the best natural sunlight.

A restrictive phrase is an adjective phrase that adds more meaning to the sentence. It is an important part of the sentence and should not be set off by commas. The meaning of the sentence will change if it is omitted, unlike the unrestrictive phrase. The sentence that contains a restrictive phrase is, "The window in the living room provides the best natural sunlight. The correct answer is option d.