The illustration depicts the categorization of two wave types.

Waves:

Yes -> mechanical waves:
longitudinal wave
transverse wave

No -> electromagnetic waves -> transverse wave

Which question, denoted as X in the diagram, aids in determining the wave type?

A. Does the wave have an amplitude?
B. Does the wave require a medium to travel?
C. Do the particles travel perpendicular to the wave?
D. Do the particles transfer energy?

B. Does the wave require a medium to travel?