49. Of the following three questions, you can find the answer(s) to question ________ from the information given by the author. 

a. What eventually led to the extinction of the robust pro
to humans?
b. What were the causes of the desiccation of the African landscape?
c.
What caused the initial spurt in Homo s brain growth?
(A) a only
(B) c only
(C) a & b only
(D) a & c only
(E) b & c only

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統計： A(2), B(17), C(6), D(5), E(6) #1575820