The tone of a Conscientious Objector is A. defiant.
A conscientious objector is a person that claims that he/she has the right to refuse to offer military service, that is to say performing service in an army when there is a compulsory enlistment of people in a national service (also called "conscription"). Generally, conscientious objectors describe themselves as pacifists or non-aggressionists. Therefore, as a conscientious objector is an individual who defies an order and shows open resistance, his/her tone can be described as "defiant".