the origins of theater 问题求助

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题目 . According to paragraph 1, theories of the origins of theater
○Are mainly hypothetical
○Are well supported by factual evidence
○Have rarely been agreed upon by anthropologists
○Were expressed in the early stages of theater’s development





Paragraph 1:　In seeking to describe the origins of theater, one must rely primarily on speculation, since there is little concrete evidence on which to draw. The most widely accepted theory, championed by anthropologists in the late nineteenth and early twentieth centuries, envisions theater as emerging out of myth and ritual. The process perceived by these anthropologists may be summarized briefly. During the early stages of its development, a society becomes aware of forces that appear to influence or control its food supply and well-being. Having little understanding of natural causes, it attributes both desirable and undesirable occurrences to supernatural or magical forces, and it searches for means to win the favor of these forces. Perceiving an apparent connection between certain actions performed by the group and the result it desires, the group repeats, refines and formalizes those actions into fixed ceremonies, or rituals.
答案d，为什么a不对呢，我觉得根据one must rely primarily on speculation, since there is little concrete evidence on which to draw.可以选出a呢，O(∩_∩)O谢谢