Choose the correct verb form: By 2050, global population ______ to 9.7 billion according to UN projections.

A. increases

B. has increased

C. will have increased

D. is increasing

核心考点：时态应用。'By + 未来时间'需用将来完成时（will have done）。解题思路：时间状语判断时态。选项分析：A为一般现在时，B现在完成时，D现在进行时均不符合时间结构。易错点：可能误选B忽略时间状语标志。

正确答案：C

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