These sentences are similarly constructed, but only one contains a restrictive clause. The commas have been omitted to eliminate any clues.
Which sentence contains a restrictive clause?
My cousin who lives in New Jersey is a senior in college.
B. Edgar Allan Poe who wrote "The Raven" is a greatAmerican poet.
C
That piece of chocolate cake which probably has a million calories in it was delicious.
X D.
He reads and studies maps for fun which is no exaggeration!