TOEFL Listening: TPO-TOEFL听力TPO - 157ZCX3378K9WJ1TR$

What are two questions about the Chauvet cave artists that the professor raises but cannot answer? A. How they lighted their work area B. How they obtained pigments for their paints C. Why they chose to paint certain animals and not others D. Why they placed their art in dark, uninhabited places