Final answer:
The correct type of heat transfer when making hard-boiled eggs is conduction.
Step-by-step explanation:
The correct type of heat transfer when making hard-boiled eggs is conduction. Conduction is the transfer of heat between objects that are in direct contact with each other. In this case, the heat from the water is transferred to the eggs through direct contact, causing them to cook.
Convection, on the other hand, involves heat transfer through the movement of a fluid, such as air or water. Radiation is the transfer of heat through electromagnetic waves, like when the Sun's rays warm the Earth. Insulation is a material that prevents or slows down the transfer of heat.