What characteristic of the mantis makes it enjoyed as a pet? They are aware of you.
They are interesting and unusual.
They are good hunters.
They have large eyes.

Interesting and unusual

Explanation:

You wouldn't want a pet for its big eyes or because it can hunt. You want it because it sparked your interest. Which is why it is interesting.

the answer is the speaker views both as possessions that reflect his importance.  

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.