Malia learns that her favorite myth has been reinterpreted in several different artistic forms. she wants to see the different ways that the story is presented.

she would need to focus on to understand these reinterpretations
a. plagiarism
b. artistic tradition
c. medium
d. cultural context

Malia would need to focus on C. medium to understand these reinterpretations.
You said in this question that there are "several different artistic forms" that this myth has been reinterpreted in. That means that various media have been used in order to do that. If she wants to understand these differences, she would have to find similarities and differences between these media. 

This is math not english

Sorry ,but i would need more information