The commonly used practice of payola in the radio industry in the 20th century relers to a) the low profits that recording companies receive from royalty fees
b)
the act of offering radio stations free promotional materials in exchange for playing certain artists
more often
C) financial compensation provided to DJs for playing certain records
d) a form of legal protection for copyrighted products

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. 

Iwould recommend the attic