Which is the strongest revision of the following sentence? if students can not be noisy, have all their trash picked up afterward, and not enter other buildings during lunch, then they can eat on the hill outside the cafeteria. a) students will be allowed to eat lunch on the hill outside of the cafeteria if they keep quiet, avoid entering other buildings, and clean up their trash afterward. b) students will be allowed to eat lunch on the hill outside of the cafeteria if the noise level is kept down, they stay on the hill, and trash is cleaned up afterward. c) if students can not be noisy, have all their trash picked up afterward, and not enter other buildings during lunch, then they can eat on the hill outside the cafeteria. d) if students can keep down the noise and their trash is cleaned up afterward, then they can eat lunch on the hill outside the cafeteria if they also avoid entering other buildings.