That ability [of John Bullyer's] to master the nine-times table had proved no momentary success.

That ability [of John Bullyer's] to master the nine-times table had proved no momentary success.

A.His ability in mathematics had required continual efforts.

B.It had been proved that mathematics had no permanent influence.

C.His ability in mathematics had brought about further achievements.

D.It had been proved that mathematics had little to do with short-term memory.

正确答案是C