3. It shows why she deserved as much recognition as Paul Revere.
Explanation:
The text to which the question refers shows Sybil Ludington's crucial importance in the struggle for American independence. In this text it is presented how Sybil not only saved his father from legalists' prison and then rode alone, in the rain and complete darkness, to inform the American army in Putnam County, New York, and Danbury, Connecticut about the arrival of the British forces.
Sybil showed a lot of courage and the text states, that this courage is what justifies it to be compared to Paul Revere.
Answer: setting up both the time/place of the setting relates to the plot because many characters that will be living in it are going to take part in the mystery.