Answer: Option D
Hindrance : a thing that provides resistance, delay, or obstruction to something or someone.
Repression : the action of subduing someone or something by force.
Obstacle : a thing that blocks one's way or prevents or hinders progress.
Restriction : a limiting condition or measure, especially a legal one.
Restraint : a measure or condition that keeps someone or something under control.
Synonym of Restraint is Restriction