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What is the detrimental effect of high temperature hypersonic flow over a vehicle?

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What is the detrimental effect of high temperature hypersonic flow over a vehicle?

(a) Communication blackout

(b) Attitude problem

(c) Altitude problem

(d) Friction causing depletion of ablation

I got this question during an interview.

My doubt is from Hypersonic Flow in portion Transonic and Hypersonic Flows of Aerodynamics

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The correct answer is (a) Communication blackout

The explanation is: At certain altitude and Mach number in hypersonic flow, the vehicles are unable to communicate by transmitting or receiving radio waves. This is due to the high temperature flow causing ionization of the chemically reactive flow which produces free electrons that absorb these radio waves. This is known as ‘communication blackout’.

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