Which of the following passages is written in tone that would be appropriate for an explanatory essay?

A. The Neolithic Revolution was really interesting. I know you want to hear more, don't even deny it!
B. The Neolithic Revolution changed everything for humans. Before the N.R., you couldn't even plant food.
C. The Neolithic Revolution was by far the most awesome and incredible event in human history.
D. The Neolithic Revolution changed human life by allowing people to live in agricultural societies.