Answer:
D, Im not very sure about this but I would say D
Explanation:
I tried
Superconductor, conductor, semiconductor, insulator
A transverse wave is a moving wave in which the current is perpendicular to the direction of the wave or path of propagation. A longitudinal wave are waves in which the displacement of the median is in the direction of the propagation.
Example:
Transverse- pond ripple
Longitudinal- crest and troff