The crest of a water wave moves to the direction the wave energy moves. parallel perpendicular

Answer;

Perpendicular

Explanation;The crest of a water wave moves perpendicular to the direction the wave energy moves.A transverse wave is a wave in which particles move up and down or side-to-side at right angles or perpendicular to the direction the wave travels.Examples of these waves are: vibrations in strings, ripples on water surface and electromagnetic waves. In a transverse wave, the particles of the medium oscillate in a direction perpendicular to the direction of propagation.

Ithink it is letter b, i may be wrong but i think that is the answer