The use of chiaroscuro was a way that Dutch artists of the Baroque period could:
A. contrast war and peace
B. Dramatize daily life
C. Mask sacrilegious symbolism
D. Avoid religious subjects

White flour this don't make sense

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

If you could give us the questions i can see if i can you! : )