What Is the Difference Between the Concepts of Congruence and Responsiveness

What is the difference between the concepts of congruence and responsiveness?

A) Congruence refers to policy, while responsiveness refers to the position of the median voter.
B) Congruence refers to the overlap between policy and the median voter's position, while responsiveness refers to shifts in policy and position.
C) Congruence is generally regarded as positive, while responsiveness is harmful to a political system.
D) Congruence refers to a system that imposes decisions on voters, while responsiveness refers to a system that listens to the demands of the voters.