The correct option is D 75∘
The two set squares we usually find in our geometry box are:
Set square 1: 90o−45o−45o
Set square 2: 90o−60o−30o
A 45o angle can be drawn using set square 1.
Both 30o and 60o angles can be drawn using set square 2.
But to draw a 75o angle, we need both set squares. And that is only possible if we keep the 30o set square adjacent to the 45o set-square.
Hence, we can’t draw a 75o angle with only one set square.