Decide What Values of the Variable Cannot Possibly Be Solutions $\sqrt { 2 x + 3 } - \sqrt { x + 1 } = 1$

Multiple Choice

Decide what values of the variable cannot possibly be solutions for the equation.
- $\sqrt { 2 x + 3 } - \sqrt { x + 1 } = 1$

A) $\{ 3 \}$
B) $\{ - 3 , - 1 \}$
C) $\varnothing$
D) $\{ 3 , - 1 \}$