I think it is the second one because the rest don't sound correct .
Which is the underlined word? I can’t give you a proper answer unless I know.
As per assembling a writing plan for an essay, the better answer, if not the best, would be B. Material that catches the reader's interest.
Many would argue that the correct answer would be D. the general idea of your essay or maybe C. a brief summary of your conclusion or perhaps A. the first section of the body of your essay. Well, they are all correct. As long as what follows is duly taken noted and is consistent to keep the flow of the essay that when the final paper is read, it isn't confusing in any way. Though generally speaking, what should come first would be the material that catches the reader's interest.
I would say C because you would need to be able to decipher what the work was trying telling you.