Learn from your mistakes and live for today don't dwell on what happened yesterday and hope for tomorrow is hope that tomorrow is better than today.
Characterization - Montresor explains how he has acted toward his enemy
The answer is b or c I think it c
A) Is not always directly stated.
Sometimes the main idea is implied instead of directly stated. You can also get the main idea from the Theme which is stated at the end of the first paragraph.
i hope i helped:)