Irrelevant Sentence
(1) There's a reason why dogs are called "man's best friend. (2) This friendship, as with most good friendships, was formed by mutual benefit. (3) The good friendship that we have with dogs is thousands of years old. (4) Dogs are of great value to people because they use their keen senses to detect threats and alert their owners by barking. (5) My favorite dog is a German Shepard. (6) People are of great value to dogs too. (7) Dogs who live with people usually have easier access to food and a safer place to stay than they would on their own. (8) That’s what friends are for.

a. (5)
b. (8)
c. (6)
d. (7)