Answer:
A) opposition
Explanation:
Dissent could be defined as a strong disagreement with someone's desicion, opinion, order, belief etc.
It is basically a resistence, a revolt against something that is imposed or widely spread and regarded as common.
The simplest way to define this is that a person who dissents is strongly opposing someone or something.
So, having this in mind, the best fitting answer would be A) opposition; each citizen must choose the best way to express an opposition.