#### Answer

$C$

#### Work Step by Step

First, we use distribution on the left side of the equation:
$12x + 12 = 36$
Subtract $12$ from both sides of the equation to collect constant terms on the right side of the equation:
$12x = 24$
Divide each side of the equation by $12$ to solve for $x$:
$x = 2$
The answer is option $C$.