Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve the equation
- $\sqrt[3]{5 x^{2}+6 x+1}=\sqrt[3]{5 x^{2}+7 x+9}$

A) $\{8\}$

B) $\left\{\frac{1}{8}\right\}$

C) $\left\{-\frac{1}{8}\right\}$

D) $\{-8\}$