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When electromagnetic waves are propagated in a waveguide -

When electromagnetic waves are propagated in a waveguide - Correct Answer they are reflected from the walls but do not travel along them.

Electromagnetic waves propagated in waveguide are reflected from the walls but do not travel along them because the waveguides are made up of conductor.

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Note:

Electromagnetic waves:

It is a transverse wave defined as composed of oscillating electrical and magnetic fields perpendicular to each other. 

The Speed of electromagnetic waves is the same as of speed of light c = 3 × 108 m/s.

It doesn’t need any medium to travel. It can travel in a vacuum.
An electromagnetic wave is a type of transverse wave.

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