Correct answer: (B) Inward current depolarizes the membrane; (D) Stronger stimulus decreases action-potential latency
Explanation
Under the conventional positive-charge current definition, inward current makes the interior less negative, depolarizing it. Once threshold is reached, the spike is approximately all-or-none rather than increasing its amplitude with stimulus strength. Stronger stimulation generally reaches threshold earlier, shortening latency. Thus B,D.
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