Answer:
To introduce one source of the settlers' fears
Explanation:
The information about the earlier colony of Sir Walter Raleigh was meant to introduce a factor that must have created doubts and fears in the minds of the new colonists. The settlers sent by Sir Walter Raleigh had disappeared mysteriously.
So, the settlers must have wondered what could have happened to them, and if the circumstances behind their disappearance might have affected them as well. So that was one source of the settlers' fears.
In Edgar Allan Poe's short story The Fall of the House of Usher, Roderick Usher writes his childhood friend a letter informing his friend about his illness. Roderick's sister is also ill and he is worried about her, as well. He developed an abnormal behavior and started to think that the mansion they live controls him and it will eventually bring his end. As we can observe, Usher is physically and mentally ill and wants a help from his childhood friend. The correct answer is C.
They shouldn't but many websites and apps do anyways. I wouldn't be surprised if Brainly was even using your data.