IN the end of the story when the conflict is resolved
"People imagine things that are not really there" is why people drew pictures of Nessie after seeing a fence post. The tourists were either not expecting a sighting or were expecting a sighting too much. So when the fence post rose up in the water, the tourists imagined a monster instead of a piece of wood. Because of the myth of Nessie in Loch Ness, tourists were led to believe that what they saw was could only be a monster.
I say it's B but I might be wrong
When they're quoting someone, or using information from a specific place.