Answer: C A B
C) activation of a sensory receptor
A) information processing in the CNS
B) signaling by an efferent PNS neuron
SYNAPSE AT THE EFFECTORS for refection action.
Explanation:
the arrival of the action potential at the effector initiate contraction of muscles and secretion by glands in response to stimulus of sighting a predator.
this involves the flow of action potential from the presynaptic neuron to the synaptic cleft where neurotransmitters, (from calcium ions fusion to the membranes) ,binds with the receptors on the muscles and post synaptic neuron to imitate synaptic reaction for action potential
this brings response in animal to run and hold still at the sight of the predator.