When there is a fire, ashes are produced.
Supporting details can do all of the enlisted options except introduce the main idea. Supporting details are there to support the main idea, so of course they cannot introduce it. They are the result of the main idea, not its creator.
Answer:
A million men and boys break for the train. Bud gets pushed to the side and is nearly trampled until someone reaches down and pulls him up and helps him keep running. Bugs gets on first and yells to Bud to throw him his case.
Explanation:
