The correct answer to the question is A). Transverse wave.
EXPLANATION:
Before going to answer this question, first we have to understand the nature of transverse and longitudinal wave.
A longitudinal wave is a mechanical wave in which the particles vibrate parallel to the direction of wave propagation. This type of wave is a series of compression and rarefaction.
The compression of a wave is the region of high pressure where the particles of the medium are very close to each other. In comparison to compression, the rarefaction of a longitudinal wave is the region of low pressure where the particles of the medium are not so close to each other.
For instance, sound wave.
A transverse wave is a mechanical wave ( except light wave) in which the direction of vibration of the particles of the medium is perpendicular to the direction of wave propagation. It moves in the form of crests and troughs.
For instance, water wave.
As per the question, the particles of the medium are moving perpendicular to the direction of the wave.
Hence, the wave will be transverse.
