Solar radiation is a form of electromagnetic radiation. Here's why Option C is the correct choice: Nature of Solar Radiation: Solar radiation includes visible light, ultraviolet light, infrared, and other types of electromagnetic waves. Transverse vs. Longitudinal Waves: Transverse Waves: In these waves, the oscillations (the electric and magnetic fields in the case of EM waves) are perpendicular to the direction of propagation. Longitudinal Waves: In these, the oscillations occur in the same direction as the wave travels. Sound waves are a common example, but electromagnetic waves are not longitudinal. Mechanical vs. Electromagnetic Waves: Mechanical Waves: These require a medium (like air or water) to propagate (e.g., sound waves). Electromagnetic Waves: These do not need a medium and can travel through a vacuum, like the solar radiation from the sun. Since solar radiation consists of electromagnetic waves that are transverse in nature, the correct option is: Option C: Transverse EM wave.