Artists use foreshortening and overlapping to create in a work of art.
a.
movement
c.
realism
b.
depth
d.
mass

The correct answer is DEPTH. We know this because Foreshortening is a particularly effective artistic device, used to give the impression of three-dimensional volume and create drama in a picture. I hope this helps a lot 

If your choices are: -cropping  -anti-aliasing-imperfection-contrastdownsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. this is the opposite of upsampling. so the answer is contrast.

They are not affected because the paint drys with the plaster on the wall, effectively making the fresco part of the wall.