Adam, Bob, Carol, Diane, and Ed are all sitting on a bench. If Adam an

Adam, Bob, Carol, Diane, and Ed are all sitting on a bench. If Adam and Diane must sit next to each other and Bob and Carol must sit next to each other, how many different seating arrangements are possible on the bench? A) 3 B) 6 C) 8 D) 12 E) (…)