I guess the mistake was that they printed QFE instead of QNH in the question
That was also the conclusion that we came to. But not until I had been through a bit of a mental ordeal, e.g. trying to work out whether the reading on the altimeter increases or decreases when you wind the subscale up or down.
As the a/c climbs, pressure decreases and the altimeter reading increases. But if you wind the subscale numbers down to lower pressure settings, the reading on the altimeter
decreases.
Obvious when you think about it, but when confronted with a purportedly 'correct' answer that contradicts what you understand, it plays havoc with the mind