In the second paragraph of the passage, the author uses the concept of an indispensable cause primarily in order to question which of the following claims? A. Generalizations about the origins of capitalist societies are defensible. B. The study of history is largely independent of philosophical concerns. C. A universal model of historical causation is indefensible. D. A historical event is caused by many factors. E. A hierarchy of the causes of a historical event can be determined.