The direct object comes after the action verb while the subjective complement comes after a linking verb. :)
It's either B or D because a tragic flaw is basically a trait that a character has that could lead to his or hers death or down fall
Source: CliffsNotes<span />
They are not effective because they don't have evidence , support of claims. I hope that this is the answer that you were looking for and it has helped you. Have a nice day.