Which topic is most likely to be the subject of an elegy? the celebration of a great successthe death of a close friendthe story of a hero's wooingthe comical side of a current event

A elegy definition a poem of serious reflection, typically a lament for the dead.
whether this person believed in some kind of faith or if they did not should be included this  should be the topic of the elegy the topic should be uplifting putting people for at that moment at peace with what has happened 

It's A, the political and culture revolution in Russia and China