For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg) ?

A. Sewage gas and gobar gas

B. B.F. gas and coke oven gas

C. Propane and LPG

D. Propane and acetylene
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