The correct answer is B.
Whatever you want to do is fine with us.
A subordinate clause does not express a complete thought and can not stand alone as a sentence.
The correct answer is C.
A narrative essay should be telling a story. It should contain the plot, setting, characters and conflict.' How to make sushi' would be considered as receipt writing, the visit at Camp Wocasuto may not be a topic for everybody since we don't know how many classmates went there. 'My favorite season' is a description without action, not a good topic for an essay. 'Museums need local funding' could be made into an interesting story where different points of views are presented, for and against arguments discussed and some real facts and examples described. It is also a topic everybody in the class could write an essay about because everybody knows what a museum is.