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.
- $(2 x+3) ^{1 / 2}+(4-x) ^{1 / 2}=4$

A) $\{-3\}$
B) $\{3\}$
C) $\varnothing$
D) $\left\{3, \frac{11}{9}\right\}$