The author implies all of the following EXCEPT: A. The ancient mathematical texts of Mesopotamia do not provide explicit proofs for all their results. B. The first Western scholars studying the history of Chinese mathematics were unaware of the proofs available in the commentaries and sub-commentaries on the Jiuzhang Suanshu C. Proofs are a method of demonstrating the logical arguments underlying a mathematical result. D. The majority of important Chinese mathematicians between 1000 and 1500 A.D. would have known of the Jiuzhang Suanshu E. The authors of the Jiuzhang Suanshu do not make any claim justifying their own authority.