Internal-existing or located on the inside of something
External-belonging to or forming the outer surface or structure of something.
The correct one is C. You are quite a hardworking young man.
Answer: Is this a multiple question? If so, I could probably help if you showed the multiple choices.
Explanation:
The common theme of the Theater of the Absurd is A.) Injustice.
Im pretty sure its verses are repeated but with slight variations