The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

The air standard efficiency of an I.C. engine is given by (where r = C

1.	The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
A.	- rγ - 1
B.	+ rγ - 1
C.	- (1/rγ - 1)
D.	one of these
Answer» D. one of these