Review the following passage from "What are the humanities good for?" by J. Martin Evans: "For a long time I held this view myself, but more recently I have come to the conclusion that there is an alternative or complementary function that the humanities fulfill. Let me quote the English scholar C.S. Lewis's comments on what he calls "the doctrine of the unchanging human heart." "I continue," he writes, "to admit that if you remove from people the things that make them different, what is left must be the same, and that the Human Heart will certainly appear as Unchanging if you ignore its changes. But I have come to doubt whether the study of this mere lowest common denominator is the best end the student of old poetry can set before himself. . . . Fortunately there is a better way. Instead of stripping the knight of his armor you can try to put his armor on yourself; instead of seeing how the courtier would look without his lace, you can try to see how you would feel with his lace; that is, with his honor, his wit, his royalism, and his gallantries. . . . It is better.
a) What is the main argument of C.S. Lewis regarding the study of humanities?

Studying the unchanging human heart is the best end for the student of old poetry.
Stripping away differences to reveal a common human nature is essential.
It is better to empathize with historical figures than to study their common traits.
The study of humanities is irrelevant in understanding human nature.