To clarify:
14. Pitch angle during descent at a constant mach number will:
a) Increase.
b) Decrease.
c) Increase at first then decrease.
d) Stay constant.
Another example of not knowing which answer to pick, even though you know exactly what will happen to TAS vs. altitude and MNo etc. Obviously you'd have to pitch more down in order to achieve a higher TAS when Local Sped of Sound increases.