Both serigraphy and lithography are popularly used by
a. automobile advertising companies
c. modern-pop artists
b. newspaper photographers
d. clothing manufacturers

c.  

modern-pop artists

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."