Answer:
C
Step-by-step explanation:
Harriet Tubman was a famous ex-slave and abolitionist. She is well known for her work in the underground railroad which was a group of safe houses that helped slaves escape from the south and seek refuge in the north.
A book about famous abolitionists would be the most useful as A would be biased, B has nothing to do with the topic, and D has nothing to do with the topic.