Which of the following statements are correct? (i) Human body is a good conductor of electricity.(ii) The air gap surrounding an electric circuit acts as a conductor. (iii) Silver conducts electricity better than any other metal.(iv) When electricity lights up a bulb, no heat is produced.

• A. (i) and (ii)                   
• B. (iii) and (iv)    
• C. (i) and (iii)      
• D. (ii) and (iii)