The right option is; c. by radiation and convection
Heat is reaching the corners of Paige’s bedroom by radiation and convection.
Convection is a process by which heat is transmitted by movement of a heated fluid such as air or water, while radiation is the transfer of energy (such as heat) in the form of particles or waves through space or through a substance. From the question, the coil (heating element) in the electric space heater is surrounded by a fluid (water or oil). The fluid is heated by the coil and the fluid carries the heat energy and reaches the surrounding air by radiation and convection.
