Read the text and answer the question by selecting all the correct responses. More than one response is correct.
In Southwest France in the 1950’s, playing children discovered Lascaux Grotto, a series of slim cave chambers that contain huge prehistoric paintings of animals. Many of these beasts are as big as 16 feet (almost 5 meters). Some follow one another in solemn parades, however, others swirl about, sideways and upside down. The animals are bulls, wild horses, reindeer, and bison outlined with charcoal and painted mostly in reds, yellow, and browns. Scientific analysis reveals that the colors were derived from ocher and other alternative iron oxides ground into a fine powder. Strategies of applying color varied: some colors were brushed or dirty on rock surfaces and others were blown or sprayed. It is possible that tubes made up of animal bones were used for spraying because hollow bones, some stained with pigment, have been found nearby.
Q. What are the bones found in the Lascaux caves believed to indicate?
(A) The subjects the artists painted various.
(B) Artists painted pictures on both walls and bones.
(C) Artists ground them into a fine powder to make paint.
(D) Artists developed special techniques for painting the walls.