Which sentence contains an adjective clause?
a. Unfortunately, the puppy just didn't know any better.
b. Because we had run out of tape, we couldn't repair the pages of Billy's favorite book.
c. Billy couldn't believe his eyes when he walked into his room and saw chewed-up paper everywhere.
d. The new puppy, which Mom and Dad gave Billy just last week, chewed up half of Chapter 15 in his favorite book.