Final answer:
Radiation is the form of heat transfer that warms objects without warming the air around them, it travels through space via electromagnetic waves. It's the same principle behind feeling warm in sunlight or from a heater.
Step-by-step explanation:
The form of heat transfer that can warm your body without warming the air in a room is Radiation (c). Heat transfer by radiation involves the movement of heat energy through electromagnetic waves. Sunlight is a common example of heat transfer by radiation. When sunlight passes through the cold vacuum of space to reach the Earth and warm its surface, this is radiation in effect. Similarly, when you're warmed by a heater in a room, even though the surrounding air may not be warm, it's because the heat is being transferred directly to your body through radiation.
Learn more about Heat Radiation