Answer:
(A) A only
Explanation:
As per the question,
An engine miss is being diagnosed using a cylinder leakage test, and
We know that if there is a leakage of air from the tail pipe, it generally indicates the leakage from an exhaust vale. Therefore we can say that the statement given by technician B that is air leaking from the tailpipe indicates a cracked cylinder head is wrong.
Now,
According to technician A
If the leakage in the cylinder exceeds over 20%, that means air is escaping from the the tailpipe, the PCV valve opening in the rocker arm cover, and the top of the throttle body or carburetor. That means excessive leakage.
Therefore, Technician A is correct.