What kind of expression was on the lady' s face after the man who offered help left

A．a man who was mending a street lamp
B．a man who offered help to a pretty young lady
C．a pretty young lady who had her car repaired
D．three children who stayed in the car

A．only when the young lady arrived in the busy street did she find the tyre flat
B．the young lady knew what had happened to the tyre even before she went to the busy street
C．the young lady didn't know the tyre was flat until her children told her
D．if the young lady had heard the man who was mending the street lamp, she would have the car repaired before she went to the busy street