Final answer:
Conscientious objectors to military service are constrained by a deep personal conviction not to take a human life.
Step-by-step explanation:
The correct answer is c) Constrained. Conscientious objectors to military service are constrained by a deep personal conviction not to take a human life. They refuse to serve in the armed forces for religious or philosophical reasons. These individuals believe that taking a human life goes against their moral or religious beliefs, and therefore they are constrained from participating in military service.