Man in business attire speaks into a microphone .
It is probably not the case that a salesman speaks to his customers through a microphone about the benefits he offers .
It is probably not the case that a salesman speaks to his customers through a microphone about the benefits he offers .
It is almost certain that a salesman speaks to his customers through a microphone about the benefits he offers .
A salesman speaks to his customers through a microphone about the benefits he offers .