The correct option is D 3,00,000 km per second
Light
is made up of packets of energy called photons. It is mainly through light, we
can see the world around us. Light follows rectilinear motion. A light wave can
be considered to travel from one point to another along a straight line joining
them. The path of light is called a ray of light, and a bundle of such rays
constitutes a beam of light. The speed of light is 3,00,000 km per second. It
is the maximum speed attained.