What is the best example of a tragic flaw

B). Lady Macbeth's ambition to see her husband become king.

Explanation:

The tragic flaw also known as 'hamartia', is demonstrated as the inherent flaw or defect in a character's personality that brings his/her downfall. It may include desire, guilt, or any other attributes taking the character towards destruction. For example, Dr. Faustus' desire to gain supreme knowledge led him to dam-nation. Similar happened with Macbeth where his desire to gain power and authority led to his tragic downfall while Hamlet met his tragic end due to his impotence to take action.

As per the given question and options, the option that exemplifies hamartia(tragic flaw) is option B(Lady  Macbeth's ambition to see her husband become king) marking the beginning of her tragic downfall and leaving Macbeth in an utter state of despair and hopelessness. Thus, option B is the correct answer.

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i have a basic answer but if you want a more in depth