We need more info, I am unable to find any pattern to this question.
Answer:
I am pretty sure it's 2 and why does my answer have to be so long it won't let me submit so just ignore everything after the 2
The man considered the "Father" of modern gospel music was Thomas A. Dorsey.
So, C & D?
Without it, all of the wildlife that thrives on the shores might not survive as well.