If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

If the air-fuel mixture in a spark ignition engine is too rich, then a

1.	If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about
A.	17:1
B.	15:1
C.	13:1
D.	10:1
Answer» E.