21. Refer to Exhibit 1-1. If the student whose study habits are illustrated here is currently studying for the 8th hour, she should

They increased the hours of how she is studying because it benefits the studying of 2 hours, and is better of the other marginal  and the cost of doing so.

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.