The most ancient examples of art, found in caves throughout europe, served to a. achieve some purpose that's a mystery. b. tell the story of their tribes. c. playfully decorate the animals they hunted. d. represent sacred gods.

The answer is letter B. tell the story of their tribes. Prehistoric painters used the pigments available in the vicinity.   The most common subjects in cave paintings are called finger flutings which are  large wild animals, such as bison, horses, aurochs, and deer, and tracings of human hands. This can conclude that they want to tell people and decorate the cave about the situations they experience.

Walls is easier to memorize