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Subject :NSO    Class : Class 8

Calorific values of some fuels are given:

On the basis of this data, find out the correct order of efficiency of fuels.

A LPG > CNG > Diesel > Coal
B Coal > Diesel > LPG > CNG
C Diesel > CNG > Coal > LPG
D CNG > LPG > Diesel > Coal

It should be option be, right?

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