Which aspect of Act 2 of The Monsters Are Due on Maple Street marks it as science fiction and not fantasy fiction?

It is about aliens and takes place on another planet.
It is about humans who meet aliens here on Earth.
It is about aliens visiting Earth and observing humans.
It is about magical events that cannot be explained.

When it comes to the episode "The Monsters are Due on Maple Street" and the characteristics of science fictions, we can select the following option as the one containing what characterizes it as such:

C. It is about aliens visiting Earth and observing humans.

What happens in "The Monsters are Due on Maple Street"?

After a flash of light crosses the sky, strange things begin to happen on Maple Street. When a little boy says the flash was caused by aliens, the adults are skeptical at first, but they soon begin to suspect each other. Chaos soon breaks loose.

All the while, the humans are being observed by aliens. It turns out that the little boy was right. The aliens do not meet with the humans, however. Their intention is to make the humans fight among themselves.

Taking the information above into consideration, we can select option C as the one containing what marks the story as science fiction.

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