Correct Answer - C
When a neuron is not conducting any impulse,i.e, resting the axonal membrane is comparatively more permeable to potassium ions`(K^(+))` and nearly impermeable to sodium ions `(Na^(+))`. Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm. Consequently, the axoplasm inside the axon contains high concentration of `K^(+)` and negatively charged proteins and low concentration of `Na^(+)`.These ionic gradients across the resting membrane are maintained by the active transport of ions by the soduim potassium pump which transpots `3 Na^(+))` outwords for `2K^(+))` into the cell. As a result, the outer surface of the axonal membrane possesses a positive charge while is inner surface becomes negatively charged and therefore is polariesed.
