The correct option is C 70 degrees
We have two types of set squares
1. 30-60-90 degree set square
2. 45-90-45 degree set square
Using set squares, we can only measure these angles or the angles made by combination of any of these angles.
So an angle of 30, 45, 60, 75, 90, 105, 120, 135, 150 degrees etc can be measured using set squares.
Hence the correct answer to this question is 70 degrees.