this is because for A, conducting research before you chose a topic makes no sense because you dont know your topic so there is nothing to research.
for b, before editing also doesnt make sense. this is because editing is after writing and when you write, you need to know facts.
for d, you should be researching before you even start! if u research when u already finished the second draft, that means the first and second has no information.
c is correct not only because the other answers dont make sense but also because u should know what you are writing and your information before u begin.
