Answer: A
Explanation:
If it was left a ls they, the readers would have no idea who is being referred to
A hunter named Eckels pays $10,000 to travel with Time Safari, a time machine company that takes hunters back to the time of dinosaurs and allows them to hunt Tyrannosaurus Rex.
Metaphor because the clouds and fog are being compared to a completely different thing: racial prejudice and misunderstanding.