Cho biểu thức: (-x^2 + x - 1)(6x^2 - 5x + 1)

A. (-$x^2$ + x - 1)(6$x^2$ - 5x + 1) > 0 $\iff x\in \left(\frac{1}{3};\frac{1}{2}\right)$

B. (-$x^2$ + x - 1)(6$x^2$ - 5x + 1) < 0 $\iff x\in \left(\frac{1}{3};\frac{1}{2}\right)$

C. (-$x^2$ + x - 1)(6$x^2$ - 5x + 1) > 0 $\iff x\in \left(-\infty ;\frac{1}{3}\right)\cup \left(\frac{1}{2};+\infty \right)$

D. (-$x^2$ + x - 1)(6$x^2$ - 5x + 1) < 0 $\iff x\in \left(-\infty ;\frac{1}{3}\right)$