Why does the author mention that Upper Paleolithic cave art seemed to have "reached a peak toward the end of the Upper Paleolithic period, when the herds of game were decreasing"? A. To argue that Upper Paleolithic art ceased to include animals when herds of game became scarce B. To provide support for the idea that the aim of the paintings was to increase the supply of animals for hunting C. To emphasize the continued improvement in the quality of cave art throughout the Upper Paleolithic period D. To show the direct connection between the decrease in herds of game and the end of the Upper Paleolithic period