According to the author, the theory based on fluctuating resource availability might resolve "apparently conflicting and ambiguous results" because A. It explains how a particular circumstance can produce disparate effects. B. It does not assume that all of the results are instances of the phenomenon that the theory is intended to explain. C. It predicts that seemingly minor variations in research methodology can have a dramatic effect on results. D. Its account is based on a statistical tendency rather than on the supposition that the results arise from a causal connection. E. It indicates why a similar outcome may be preceded by very different circumstances on different occasions.