Final answer:
Brian is led to the berries because of certain events that occurred involving Meriwether and the prairie dog's food preferences.
Step-by-step explanation:
Brian is led to the berries because Meriwether ate the last berry without consulting William. This incident caused Brian to search for more berries. Additionally, the prairie dog only let William feed it dried corn, so Brian had to find an alternative food source, which led him to the berries