“I wish Granny would hurry up,” said Sarah with a start. Then she realized that she didn't want to cause any alarm, so she added, “She's bringing supplies from town and should be here very soon.” How does the excerpt contribute to the meaning of the passage?

A.
It reveals the real dangers runaway slaves were in, and the need to protect them.

B.
It reveals her impatience because she wants to do something else with her time.

C.
It reveals the stress of a granddaughter for her grandmother.

D.
It reveals her inner desire to be like her grandmother.