What do planets that are "too hot" or "too cold" lack?

What do the details in this excerpt readers to infer about the barbarians?

What does the following advertisement most clearly reveal about the views of its intended audience? a. the audience worries about the health of pets. b. the audience owns both puppies and kittens. c. the audience has a soft spot for cute animals d. the audience wants to buy a dog or cat.

Those are books that need to be returned to the library what is the antecedent of the pronoun those