What is the influence of decreasing aeroplane weight on Mcrit at constant IAS ?

Question

Question ATPL - Airline Transport Pilot license - Principles of Flight

QuizVDS · Accepted Answer

Mcrit increases as a result of flying at a smaller angle of attack.

QuizVDS · Answer

Mcrit increases as a result of compressibility effects.

QuizVDS · Answer

Mcrit decreases as a result of flying at a greater angle of attack.

QuizVDS · Answer

Mcrit decreases.

Id 352 - ATPL - What is the influence of decreasing aeroplane weight on Mcrit at constant IAS ?