The correct option is A extracellular fluid
There is an unequal distribution of different ions in the ECF and axoplasm.
ECF is rich in sodium and chloride ions.
In axoplasm, the main cation is potassium ion and the 2 dominant anions are phosphates attached to the molecules (e.g:- 3 in ATP) and amino acids.
Axolemma has more potassium leakage channels than sodium leakage channels.