The best answer choice that explains the author's purpose in the paragraph is:
C. to show what Louisa May Alcott was like as a child.
The passage provides insight into Louisa May Alcott's character by describing her affectionate nature, her struggles, and her compassionate actions, which reflect her personality as a child. It highlights her sensitivity to the needs of others, as well as her experiences and feelings, painting a broader picture of who she was during her early years.