Which excerpt from The Monsters Are Due on Maple Street best foreshadows the idea that the residents of Maple Street are becoming a dangerous mob?

The crowd picks this up again and with it their suspicions come back with a rush. The murmur becomes a loud chant filling the air with accusations and demands for action. Two of the men pass Don right up the steps. Goodman flattens himself against the screen door.
“There's something you can do, Charlie. You could go home and keep your mouth shut. You could quit strutting around like a self-appointed hanging judge and just climb into bed and forget it.”
“Well . . . sometimes I go to bed late at night. A couple of times . . . a couple of times I'd come out on the porch and I'd see Mr. Goodman here in the wee hours of the morning standing out in front of his house . . . looking up at the sky.”
"That don't prove a thing. Any guy who'd spend his time lookin' up at the sky early in the morning—well there's something wrong with that kind of a person. There's something that ain't legitimate."

The excerpt taken from "The Monsters Are Due on Maple Street" which most adequately foreshadows the idea of "Maple Street's residents turning into a dangerous mob would be:

A). The crowd picks this up again and with it their suspicions come back with a rush. The murmur becomes a loud chant filling the air with accusations and demands for action. Two of the men pass Don right up the steps. Goodman flattens himself against the screen door.

"Foreshadowing" is the literary device that signals the readers about the upcoming events in the story and raises their interest and level of curiosity to know about the upcoming actions in the plot.
In the first excerpt, the descriptions regarding the suspicion, murmuring chants among the crowd, accusations, etc, reveal the upcoming event of residents converting into harmful mobs in the story.
Thus, option A is the correct answer.

Learn more about "Foreshadowing" here:

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