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Which of these techniques is employed to delay the critical Mach number?

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Which of these techniques is employed to delay the critical Mach number?

(a) Increasing the thickness of airfoil

(b) Swept wing

(c) Increase camber

(d) Decrease drag – divergence Mach number

I have been asked this question in an interview.

The query is from Critical Mach Number in portion Linearized and Conical Flows of Aerodynamics

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Correct choice is (b) Swept wing

The best I can explain: There are two ways employed to increase the critical Mach number thereby increasing drag – divergence Mach number. First is to reduce the thickness of the airfoil, and second is to add sweep to the wing.

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