Let $f(x) = 3x^{10} - 7x^{8} + 5x^{6} - 21x^{3} + 3x^{2} - 7$. Then $\lim_{h \rightarrow 0} \frac{f(1-h) - f(1)}{h^{3} + 3h}$ is:

  • A
    does not exist
  • B
    is $\frac{50}{3}$
  • C
    is $\frac{53}{3}$
  • D
    is $\frac{22}{3}$

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