Which is not true about the upper paleolithic period? A. People made tools by chipping flint pebbles into blades and scrapers that had sharp edges.
B. Humans and animal forms begin to be seen in art
C. The period took place between 40,000 and 4,000 BCE
D. In cave art, Artists used the cave's irregularities to create images

i think this is true

i got this answer from a really friend, and it was right.

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.

c would  be the answer.