There's nothing wrong with this pronoun agreement because nothing needs to be changed. It's a trick question.
Example #1: The Sun Rising (By John Donne) ...
Example #2: Shall I Compare Thee to a Summer's Day (By William Shakespeare)
Example #3: When I Have Fears (By John Keats)
Example #4: Vestiges (By Van Jordan)
Since fallow means empty, the word occupied is obviously its opposite. So, in order to complete this analogy, we need to find another pair of words that are each other's opposites. The correct answer should be C. free:busy.