If x4 - 83x2 + 1 = 0, then a value of x3 - x-3 can be:

Answer: Option B

$$\begin{array}{rl}& x^4-83x^2+1=0\\ & x^2-83+\frac{1}{x^2}=0\\ & x^2+\frac{1}{x^2}=83\\ & x^2+\frac{1}{x^2}-2=83-2\\ & {\left(x-\frac{1}{x}\right)}^2=81\\ & x-\frac{1}{x}=9\\ & {\left(x-\frac{1}{x}\right)}^3=9^3\\ & x^3-\frac{1}{x^3}-3\times 9=729\\ & x^3-\frac{1}{x^3}=756\end{array}$$