Keith is correct. The only current CQB question (that's CQB 13 or 14) of this type is 12101 in our database which is:
Q 12101. A Krueger flap is normally located at the:
(A) leading edge.
(B) trailing edge.
(C) trailing edge close to the wing root.
(D) trailing edge close to the wing tip
The two quoted are probably old versions of this question. I've removed Q3152 because it has two correct answers and is unlikely to still be in use (even by the UK CAA) but I've left Q5364 in the database:
Q 5364. On an airplane, the Krueger flaps are;
(A) leading edge flap close to the wing root
(B) Trailing edge flap close to the wing root
(C) leading edge flaps close to the wing tip
(D) trailing edge flaps close to the wing tip
because, although most states will have replaced it with the current version, it only has one correct answer. In both cases answer (A) is correct. If anyone sees the dodgy third question in an exam:
Q 3152. On an aircraft, the Krueger flap is a;
(A) leading edge flap
(B) leading edge flap close to the wing root
(C) leading edge flaps close to the wing tip
(D) trailing edge flap
please let either me or Keith and also your FTO know as soon as possible and, if you have an Aviation Authority that has an appeal system, appeal it.