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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.
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》