Final answer:
The happens to the crowd of people at Grover's Mill is: C. They run from the aliens.
Step-by-step explanation:
The scene in question appears to describe a catastrophic event where a crowd of people at Grover's Mill faced a terrible outcome due to the invasion of aliens. In the texts provided, there is a description of people running away in panic from a great heat and light. However, the provided text also describes a thorough destruction where nothing is left of the aviators, nor of the vegetation and flesh, which indicates that the individuals could be burned beyond all recognition (Option D).
While both scenarios involve running and being burned, the evidence points more conclusively towards Option D, as the passages specifically mention that no trace of human flesh remained after the incident, suggesting complete incineration. So the answer is option C.