Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?

A. Electrons are present in metals but not in salt solutions
B. Metals are conductors while salts are electrolytes
C. Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution  
D. salts ionize in aqueous solutions while metals do not
E. Metals are reducing agents while salts are not

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Correct Answer: C