Listen. do you hear it? no matter where you are, if you stick your head out a window for a minute or two you'll probably hear a dog barking.
what is it they're trying to say? does that racket actually mean something? why do dogs bark? which best explains how the passage supports the author's purpose?

a) the purpose is to instruct; it provides supporting details about the abilities of dogs.

b) the purpose is to entertain; it uses a humorous tone.

c) the purpose is to inform; it asks a question that will be answered by the text.

d) it is trying to convince you that you are the smartest animal of all.