Which one of the following statements is true ?

The correct option is D The sound waves in air are longitudinal while the light waves are transverse.
Transverse waves are waves in which the direction of vibration of particles in a medium is perpendicular to the direction of propagation of the wave. Light waves (and all electromagnetic waves) are transverse waves.

Longitudinal waves are waves in which the direction of vibration of particles in a medium is along the direction of propagation of the wave. Soiund waves are longitudinal waves.

So option d is correct.