Let $f(x)$ be continuous on $[0, 5]$ and differentiable in $(0, 5)$. If $f(0) = 0$ and $|f^{\prime}(x)| \leq \frac{1}{5}$ for all $x$ in $(0, 5)$, then which of the following is true for all $x$ in $[0, 5]$?

  • A
    $|f(x)| \leq 1$
  • B
    $|f(x)| \leq \frac{1}{5}$
  • C
    $f(x) = \frac{x}{5}$
  • D
    $|f(x)| \geq 1$

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