The fastest mode of transmission of heat is Radiation.
A. True
B. False

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Hint: According to thermodynamic systems, heat transfer is defined as the movement of warmth across the border of the system because of a difference in temperature between the system and its surroundings. Interestingly, the difference in temperature is claimed to be a ‘potential’ that causes the transfer of warmth from one point to a difference. Besides, heat is additionally referred to as flux.

Complete step by step answer:
Now from the question
There are three modes of heat transfer
1. Conduction
2. Convection
3. Radiation
Radiation is fastest among all as it travels with the speed of light.
Therefore option A. is correct.

- Conduction
The process during which heat flows from objects with higher temperature to things with lower temperature.
Conduction Examples
Following are the samples of conduction:
1. Ironing of garments is an example of conduction where the warmth is conducted from the iron to the garments.
2. Heat is transferred from hands to cube leading to the melting of a cube when held in hands.

- Convection
The movement of fluid molecules from higher temperature regions to lower temperature regions.
Convection Examples
Examples of convection include:
1. Boiling of water, that's molecules that are denser move at rock bottom while the molecules which are less dense move upwards leading to the circular motion of the molecules in order that water gets heated.
2. Warm water round the equator moves towards the poles while cooler water at the poles moves towards the equator.

- Radiation
Thermal radiation is generated by the emission of electromagnetic waves. These waves take away the energy from the emitting body. Radiation takes place through a vacuum or transparent medium which may be either solid or liquid. Thermal radiation is the result of the random motion of molecules within the matter. The movement of charged electrons and protons is liable for the emission of electromagnetic waves.
Radiation Example-
Following are the samples of radiation:
1. Microwave radiation emitted within the oven is an example of radiation.
2. UV rays coming from the sun is an example of radiation.