Heat can be transferred through conduction, convection, and radiation. what is necessary in order for heat to be transferred by conduction? a. the substances must be liquids or gases. b. the objects must be in direct contact with one another. c. heat must be transferred in the form of currents. d. heat must be transferred through space.

The objects must be in direct contact with one another.

Explanation:

Heat is transferred by conduction when objects are in direct contact with one another.

Heat transfer through space is radiation, and heat transfer through currents in liquids or gases is convection.

it is b

Explanation:

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