Rewrite the Expressions with Rational Exponents as Radical Expressions, and Then

Multiple Choice

Rewrite the expressions with rational exponents as radical expressions, and then solve the equation.
- $\left(x^{2}-3\right) ^{1 / 2}-(x+3) ^{1 / 2}=0$

A) $\{-3,3\}$
B) $\{2,3\}$
C) $\{-2,3\}$
D) $\{-3\}$