He was given in to much fanaticism.

reason
kindness
passivity
violence

The correct answer is D. violence.

Fanaticism is an extreme belief in something, especially a religion or cause. It can lead to violence, as people who are fanatical about something may be willing to hurt others in order to achieve their goals.

Reason is the ability to think clearly and rationally. Kindness is the quality of being friendly, generous, and considerate. Passivity is the state of being inactive or not taking action.

None of these options are as closely related to fanaticism as violence.