Option ( A) is correct.
A quantum of light is called a photon.
Light is made of these packets of energy called as photons. These photons have zero rest mass.They possess momentum and travel with the velocity of light. They are electrically neutral. The energy of the photon is given by
E= h f
E= energy of photon
h= planck's constant
f= frequency of the photon
The higher frequency photons have more energy as compared to the lower frequency photons.
