Which book propounds the Eight Influential Points“八会穴” for the first time in the following books？

A.Huangdi’s Internal Classic·Plain Question 《黄帝内经·素问 》

B.Huangdi’s Internal Classic·Lingshu 《黄帝内经·灵枢 》

C.Difficult Classic 《难经》

D.Great Compendium of Acupuncture and Moxibustion《针灸大成》

E.Supplement to the Invaluable Prescribtions《备急千金要方》

正确答案：Difficult Classic 《难经》