What printmaking technique did margaret preston use?

What statement about the influence the armory show had on artist is true? a) it unified the american artist in there desire to create representational art b) it influenced europen artist to imitate styles of art created by american artists c) it opened the eyes of american artist bold new ways of making art from europe d) after the show europen artist started to experiment

How do i attach images to my questions on

What does bts stand for? what is the importance of bts? who first started it?