The knocking in C.I. engine can be prevented if the first element of the fuel and air is having

The knocking in C.I. engine can be prevented if the first element of t

1.	The knocking in C.I. engine can be prevented if the first element of the fuel and air is having
A.	low density
B.	medium density
C.	high density
D.	none of the above
E.	None of the above
Answer» D. none of the above