#### Answer

D

#### Work Step by Step

Let a be the measure of the angle.
The measure of the supplement is $180-a$.
Write an expression for the measure of the angle using the information given.
$a=2(180-a)-12$
use the distributive property
$a=360-2a-12$
$a=348-2a$
add 2a to each side
$a+2a=348-2a+2a$
$3a=348$
divide each side by 3
$3a\div3=348\div3$
$a=116$