Why is understanding how much Old Yeller loves Travis important?

A.It allows the reader to better understand why Travis eventually comes to like Old Yeller.
B.It allows the reader to better understand why Old Yeller will risk his life to protect Travis.
C.It demonstrates how dogs are the best companions for young boys.
D.It proves that Mrs. Coates was wrong to try and shoo Old Yeller away when she first saw him.