Final answer:
Literary critics compare the works of artists and authors who focus on the same subject matter to identify differences and understand unique perspectives.
Step-by-step explanation:
Literary critics compare the works of artists and authors who focus on the same subject matter in order to identify differences between the works and determine each artist or author's unique perspective. By analyzing the nuances and approaches of different works, critics can gain a better understanding of the authors' and artists' opinions. Therefore, option A is the most likely reason for literary critics to compare the works of artists and authors who focus on the same subject matter.