Who can answer this ATPL type performance question?

[Gysbreght]

I would say it is a stupid question because it does not provide the information that is necessary for answering it.

Maintaining the same IAS descending from 35000 to 5000 feet the Mach number will reduce. Assuming that the change of Mach has no effect on the cL - cD - AoA relationship, the AoA and L/D will be constant. Pitch attitude is the sum of AoA and flight path angle, and the latter depends on L/D and the thrust setting.

So assuming zero (change of) thrust and zero Mach effects, the correct answer is "B".

P.S. The difference between EAS and CAS/IAS is one of the compressibility effects that are governed by Mach number.