TPO4 Cave Art in Europe 一题

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The subjects of the paintings are mostly animals. The paintings rest on bare walls, with no backdrops or environmental trappings. Perhaps, like many contemporary peoples, Upper Paleolithic men and women believed that the drawing of a human image could cause death of injury, and if that were indeed their belief, it might explain why human figures are rarely depicted in cave art. Another explanation for the focus on animals might be that these people sought to improve their luck at hunting. This theory is suggested by evidence of chips in the painted figures, perhaps made by spears thrown at the drawings. But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared. Perhaps the paintings were inspired by the need to increase the supply of animals. Cave art seems to have reached a peak toward the end of the Upper Paleolithic period, when the herds of game were decreasing.



7．According to paragraph 3, scholars explained chips in the painted figures of animals by proposing that
○Upper Paleolithic artists used marks to record the animals they had seen
○the paintings were inspired by the need to increase the supply of animals for hunting
○the artists had removed rough spots on the cave walls
○Upper Paleolithic people used the paintings to increase their luck at hunting


开始文中的确是说过为了使捕猎更加走运(D的观点)，但是后面一个but不就给否定了么。而且在后面还提出了新的观点(即选项B的观点)。

为什么答案选D    我思路有什么问题？ 请指点