Bumping up thread again.
Why A is wrong and D is right here?
this question is horrible. you should run away from this source as fast as you can. don't look back.http://www.manhattangmat.com/forums/so- ... t8142.html
you could argue for any one of (a), (c), or (d) here. all are acceptable.
if this were an official problem, it would say something like "in order to warm the rooms".
for me the post could be even closed
KUDOS is the good manner to help the entire community.