Let $f(x) = \begin{cases} x^p \sin \left( \frac{1}{x} \right) + x|x^3|, & x \neq 0 \\ 0, & x = 0 \end{cases}$. Then the complete set of values of $p$ for which $f''(x)$ is continuous at $x = 0$ is:

  • A
    $[2, \infty)$
  • B
    $[3, \infty)$
  • C
    $(4, \infty)$
  • D
    $[-2, \infty)$

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