The word “conscription” refers to an involuntary labor, especially military service.
The adjective “compulsory” means required; obligatory.
The draft refers to the system of forcing people to serve in the military.
These last three words are then synonymous.
Hence the word “suffrage” does not match with that definition, indeed it is the right or chance to vote, express an opinion or participate in a decision.
A is the correct answer.