Athermoreceptor in the skin converts heat energy to nerve impulses. this conversion is called

A thermoreceptor in the skin converts heat energy to nerve impulses. This conversion is called sensory transduction.
 Sensory transduction can be defined as the conversion of a sensory stimulus from one form to another. In this case, a receptor cell or exteroceptor (receive external sensory stimuli) converts the energy of a stimulus into an action potential (nerve impulse) which is then transmitted along axons towards the central nervous system for integration.

Bis the correct answer.

The answer is d. when it begins to fall back to the child's hand