The measure of the angle 3 is 84°, the correct option is the last one.
How to find the measure of the angle?
Here we can see that we have a quadrilateral parallelogram, the thing that we need to know to solve this is that the sum of opposite angles (angles in opposite vertices) must add up to 180, then we can write:
m∠1 + m∠3 = 180
96 + m∠3 =180
m∠3 = 180 - 96
m∠3 = 84
The correct option is the last one.