Answer:
What incited the British soldiers to shoot into the crowd
Step-by-step explanation:
The first witness account said that the soldiers fired with no reason, the only things that could have triggered them except some people throwing snowballs. They said that Captain Preston ordered fire several times.
Captain Preston's account is the exact opposite of that. He says that he never told them to fire, but only told them to "stop their fire" after they began shooting. He said that the people were the ones that said "fire"