During the absolute refractory period which of the following is true?
A. If a neuron reaches threshold, the action potential goes to completion.
B. The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold.
C. It is possible to trigger a new action potential, but only with an unusually strong stimulus.
D. No stimulus of any strength will trigger a new action potential.
E. The signal grows weaker with distance.
Answer: D
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