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.

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.