Faulkner's research findings are based on __. A．a survey of farmers in northern Japan B．tests performed on a thousand old people C．the study of brain volumes of different people D．the latest development of computer technology

A.a
B.tests
C.the
D.the

【参考答案】

C
从第三段可知，他研究了上千个不同年龄、不同职业的人的大脑。