The correct answer is D. Hamartia.
The leaders line of tragic element reveals hamartia.
Hamartia means miss the mark. It was first used in poets by Aristotle. If used in tragedy, hamartia was known as tragic flaw or error of protagonists.
It can be a error of wrong doing, error which results from ignorance or error of judgement.
Some authors like Francis Fergusson described it as the inner quality which initiates as movement of spirit.