I just put the question through my E6B on my iPhone and the ASA CX2 pathfinder and the answer came up as 1598ft.
So one of us is not reading the question correctly.....
The question:
An aerodrome elevation is 968ft and the QFE is 992mb, what is the aerodrome pressure altitude?
A 1598ft
B 338ft
C 720ft
D 1270ft