For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with

For improving the soil condition and efficiency of earthing s

1.	For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with
A.	Mixture of copper and nickel
B.	Mixture of chloride and sodium
C.	Mixture of chloride and sodium
D.	Mixture of salt and coal
Answer» E.