Which is the earliest existing monograph on acupuncture and moxibustion and acupoints？

A.The Moxibustion Classic of Eleven Foot-arm Meridians《阴阳十一脉灸经》

B.B.The Moxibustion Classic of Eleven Yin-Yang Meridians《足臂十一脉灸经》

C.Huangdi’s Internal Classic《黄帝内经》

D.Difficult Classic《难经》

E.The ABC Classic of Acupuncture and Moxibustion《针灸甲乙经》

正确答案：The ABC Classic of Acupuncture and Moxibustion《针灸甲乙经》