The four books refer to the Great Learning, The Doctrine of the Mean, The Analects of Confucius and Mencius.

So choose B.

Ps: Chunqiu is one of the Five Classics, which refers to The Book of Songs, Shangshu, Book of Rites, Yijing and Chunqiu. Chunqiu is usually published together with Zuo Zhuan, Yang Gongzhuan and Gu Liangzhuan, which explain Chunqiu.