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(B) When a neuron is in a resting state,the axonal membrane is more permeable to $K^{+}$ ions and nearly impermeable to $Na^{+}$ ions.Additionally,the

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$I-$ True,$II-$ True,$III-$ True,$IV-$ False

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(B) When a neuron is in a resting state,the axonal membrane is more permeable to $K^{+}$ ions and nearly impermeable to $Na^{+}$ ions.Additionally,the membrane is impermeable to the negatively charged proteins present in the axoplasm.Therefore,the axoplasm inside the axon contains a high concentration of $K^{+}$ and negatively charged proteins,and a low concentration of $Na^{+}$.In contrast,the extracellular fluid outside the axon contains a low concentration of $K^{+}$ and a high concentration of $Na^{+}$.Statement $I$ is True ($K^{+}$ and proteins are high inside).Statement $II$ is True ($Na^{+}$ is low inside).Statement $III$ is True ($K^{+}$ is low outside).Statement $IV$ is False (the fluid outside contains high $Na^{+}$,not $Mg^{++}$ or negatively charged proteins).Thus,the correct sequence is $I-$ True,$II-$ True,$III-$ True,$IV-$ False.

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