The correct answer is C) Radiation. Radiation is the mode of heat transfer associated with the transport of thermal energy through a transparent medium by means of electromagnetic energy in the infrared spectrum. This is because infrared radiation, which is part of the electromagnetic spectrum, can travel through transparent media, such as air or glass, and transfer thermal energy without the need for physical contact or a medium. The other options are incorrect because: A) Conduction involves the transfer of heat through direct contact between materials, B) Sublimation is the direct transition of a substance from the solid to the gas phase, and D) Convection is the transfer of heat by the movement of a fluid, such as air or water.