Direct object pronouns can also be used to avoid repeating direct object noun that have already been mentioned
The direct object simply refers to the individual who received a particular action. For example, in the sentence. Bob sells shoes. The direct object is shoes.
The direct object pronoun is typically used instead of the direct object noun. Examples include her, him, them me, and us.
Samantha is creating an article from the 1700s and 1800s. One source provides information from the 1900s to modern day, therefore doesn't work in this case. So the choice of C doesn't work.
