In the list, some factors
increase ground roll, some decrease it, with the caveat that the effect of flap
is not simple - depends on how much and when you select it - and that density
and pressure altitude are linked
Nevertheless I got the required answer by selecting 1, 3, 5, and 8, all of
which the examiner assumes give a shorter roll. The rest of the choices give
some up and some down, so no clear cut answer
Bad question The examiner is trying to be too clever...