What point is Brutus most clearly making in lines $12-15?$

A $.$ ?Leaders are abused when power is taken from them, but Caesar has escaped this fate because of people's affections for him.

B $.$ ?Leaders abuse power when they wield it without feeling the need for mercy, and Caesar has never been guided by feelings.

C $.$ ?Leaders abuse power when they force others to feel guilt, and Caesar has often attempted to manipulate others' feelings.

D $.$ ?Leaders are abused when they are unable to exercise mercy, but Caesar has insisted on following his reason in this matter.