The interval of the decreasing function \[f(x)={{x}^{3}}-{{x}^{2}}-x-4

1.	The interval of the decreasing function \[f(x)={{x}^{3}}-{{x}^{2}}-x-4\]is
A.	\[\left( \frac{1}{3},\,1 \right)\]
B.	\[\left( -\frac{1}{3},1 \right)\]
C.	\[\left( -\frac{1}{3},\,\frac{1}{3} \right)\]
D.	\[\left( -1,-\frac{1}{3} \right)\]
Answer» C. \[\left( -\frac{1}{3},\,\frac{1}{3} \right)\]

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The interval of the decreasing function \[f(x)={{x}^{3}}-{{x}^{2}}-x-4\]is

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