Answer: The neuron will be stimulated to a full action potential.
Explanation:
The all-or-none principle states that if the intensity of a stimulus is up to OR above the threshold, the neuron is stimulated to a full potential; while the neuron is not stimulated at all if the intensity of the stimulus is below a definite threshold.
Thus, twice the normal amount of stimuli would cause the neuron to be depolarized and STIMULATED TO A FULL POTENTIAL.