'"Answer:
A. Defiant.
Step-by-step explanation:
The tone displayed in "Conscientious Objector" is 'defiant' as it refers to a person who defies a particular requirement due to reasons of conscience or an individual who refuses to perform certain military service on the grounds of liberty of thoughts, conscience, or religion. It could be simply as the word displays the objection, defiance or resistance to certain activity due to conscientious reasons. Thus, the tone that is best exemplified by the term is "defiant".