B. She served as president for 23 years before resigning amidst claims that money was being mishandled internally.
Explanation:
For this question, you want an answer that is targeting Clara as its main point. The other answers (A, C, and D) are all incorrect because they are talking about topics unrelated to Clara, such as the Civil War, American Red Cross, etc. Thus, your best option is B.
I hope this helps you a bit! If you need any more help with this topic feel free to message me!
