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
- $\sqrt{\mathrm{x}+6}+\sqrt{2-\mathrm{x}}=4$

A) $\{\sqrt{31},-2\}$
B) $\{-2\}$
C) $\{0\}$
D) $\{2,-2\}$