单选题 The author provides information that would answer which of the following questions'?
Ⅰ. What eventually led to the extinction of the robust proto-humans?
Ⅱ. What were the causes of the desiccation of the African landscape?
Ⅲ. What caused the initial spurt in Homo's brain growth?

• (A) Ⅰ only
• (B) Ⅲ only
• (C) Ⅰ and Ⅱ only
• (D) Ⅱ and Ⅲ only
• (E) Ⅰ, Ⅱ, and Ⅲ