I would say shame, since the line says "repentance", which means to express that you are sorry for something. You would do this usually if your are ashamed of something you did and want to apologize.
It's more important to what a person does because as they say, actions speak louder than words do. A person can think a certain way but not act on it but what a person does reflects what they decide internally and what they wanted to do with that idea externally showing that they are serious with that idea of theirs in their head.
Dishearten, daunt, disparage, overawe, deject, depress. Hope this helps!
It is A because it’s the only one that really makes-sense
