Answer:
A) when she sold her hair.
Explanation:
This question refers to an event in the book Little Women. This describes how Jo meets Professor Bhaer. She explains that a servant girl was carrying a heavy hod of coal upstairs, when the professor noticed. He took it from her hands and helped her carry it. Jo says that she likes this kind of behaviour. We know that Jo appreciates kindness, service, and compassion towards others. An example of this is the way in which she was willing to sell her hair to help her family.