Answer:
D. Othello is weakened by sadness.
Explanation:
This is the right answer as Othello states, "If that thou be'st a devil, I cannot kill thee," which enables the peruser to deduce that regardless of whether he/she/they are the evilest being on all of Earth, Othello won't most likely murder them because of her trouble.
Subsequently, this selection communicates her actual shortcoming that is sadness.
The turning point is when the plot changes or takes the reader by surprise. Basically just a turn in a different direction.