Which phrase best defines radiant energy? (a)mechanical waves that require a medium to travel through
(b)energy transferred from the earth to the sun
(c)particles that move perpendicularly in the medium
(d)energy transmitted by an electromagnetic wave

I think is b

Explanation:

if im wrong, heres some information:

mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.[1] While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position. Mechanical waves transport energy. This energy propagates in the same direction as the wave. Any kind of wave (mechanical or electromagnetic) has a certain energy. Mechanical waves can be produced only in media which possess elasticity and inertia.

D.)  Energy transmitted by an electromagnetic wave.

Explanation:

In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.