I did the quiz. The true answers to this question is
2.Michelangelo used the hatching technique of drawing parallel line close together
1.Leonardo used the sfumato technique of blending and blurring chalk so edges nearly dissapear
3.Van Gogh used a variety of expressive strokes to create different surfaces and textures.
Thanks to the above answer, i got it wrong. I have copy-pasted from the question, putting the answers here.
I hope this helps.
~Rosy67