so you are being asked:
is |x-3| = 3-x ?
this will be true when x=3 or x<=0
KillerSquirrel, from my calculations i gather that the formula is true for every x<=3.
(try x=3, x=2,x=1, x=0), it still means you are correct of course.
the OA is B.
please tell me how did you arrive to those values, perhaps it's my bad.
i'll be happy to know in general how you solve absolute values questions.