Who shot the gun?

Choices:
A. the man who was doing a prank
B. The man who the pranksters knocked on his trunk
C. not enough information
D. the man who was riding a bike
The man who the pranksters knocked on his trunk
I was about 14 and lived near a large tract of undeveloped land where people would go and park to fool around.
There was a dirt road through the tract, but further down, it crossed two huge concrete pipes. The dirt was washed out between them, and the deep gulch made it impossible to cross in a car.
Sometimes, eight or ten of us would go looking for parked cars. If we found one or more, we would go move this incredibly heavy stump onto the road and lay a telephone pole across it. It took all of us and it was incredibly heavy.
It was impossible to drive around it because of the ditches and there was no way two or three people could move it.
We'd go back to the car and set off a big string of fire crackers or shake the cat and slap on it and run like crazy.
We'd watch from the woods as they drove like heck and come to a screeching stop at our roadblock.
The guy would get out and try to lift the pole. Never happen. Then the car would drive the other way. That wouldn't happen because of the pipes.
We'd go home leaving them in there. This was before cell phones, and it was miles to a pay phone. We'd go back the next day and find the stump and pole moved.
We thought it was real funny until one night we set it up and beat on the trunk of a car. A couple was inside, getting it on. We hadn't noticed a guy sitting on the hood with a bottle of booze and a pistol.
As we ran, he was shooting and we could hear bullets going through the underbrush. No one was hit, thank goodness.
That was the end of that stunt.