Hi Medwin,
A takeoff with more than normal takeoff flap setting will result in:
a. longer takeoff distance.
b. shorter takeoff distance.
c the same takeoff distance.
I too believe 'b' is the answer, the increased takeoff flap setting will (as most of the books say) decrease the takeoff roll but degrade the climb ability. I would imagine the questions are supposed to be relatively direct. I think the answer code in the back is just wrong (look at the ACE book,quite a few errors).
Cheers PJ_Slick