Well a resolution is the fix of an ending. A is just information about the main character, C is just a problem he had to fix, and D is a problem that started, while B is how Mike fixed the ending *helped the mall from closing by his fundraiser*
b) provide comic relief
&
d) offer parallels to Faustus's character
are both correct
I would agree with you - the conclusion should leave readers with an important thought at the end.
This thought should never be new, or opposing to the previous ideas you had been writing before. It also shouldn't be confusing, but quite conversely - it should explain everything and put everything in place.
It is a verb because it is an action, something you did.
