Aperson who has an intense phobia of heights is forced to spend an afternoon on the observation deck of a skyscraper. this is a therapy method called

Exposure therapy  

Exposure therapy refers to technique where a patient is gradually exposed and made to face their fears, anxieties and phobias without  the intention of causing any harm or danger. The goal of exposure therapy is to provide a safe environment in which patients can gradually face their fear and learn techniques to overcome it. 

the answer is:

c. economic output

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.