When you divide \( 4x + 2y - 8 \) by \( 2b \), the numerator \( 4x + 2y - 8 \) contains two variables: \( x \) and \( y \). The denominator \( 2b \) contains one variable: \( b \).
In the quotient, the expression can be written as:
\[ \frac{4x + 2y - 8}{2b} = \frac{4x}{2b} + \frac{2y}{2b} - \frac{8}{2b} \]
This quotient will still contain variables \( x \), \( y \), and \( b \). Therefore, there are a total of three variables present in the quotient.
So the correct answer is:
3