Let $g(x) = 2f(x/2) + f(1 - x)$ and $f''(x) < 0$ for $0 \le x \le 1$. Then $g(x)$:

  • A
    decreases in $[0, 2/3)$
  • B
    decreases in $(2/3, 1]$
  • C
    increases in $[0, 2/3)$
  • D
    Both $(B)$ and $(C)$

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