Which sentence correctly uses commas to separate a nonrestrictive modifier? a)the man, who owned the floral shop, watered the shop’s hanging plants. b)the young child-who is my nephew- is the cutest three-year-old ever! c)my friend john, who owns a chocolate lab puppy, is getting ready to leave for a trip. d)the student, who aced the test, was excused from completing the homework assignment.