Help i don't have much time :(
How does the niece advance the plot of the story “The Open Window”?

a. She reveals a family secret that her aunt wants to keep hidden.

b. She explains the customs of the people who live in this part of the country.

c. She tricks Framton into believing a falsehood that sends him into a panic.

d. She entertains Framton during a difficult period in his life.