GRE Reading Comprehension: ETS-GRE阅读ETS - 5072744P1K488AQS7

According to the passage, scientists are skeptical toward their equations because scientists A. work to explain real, rather than theoretical or simplified, situations B. know that well-defined problems are often the most difficult to solve C. are unable to express their data in terms of multiple variables D. are unwilling to relax the axioms they have developed E. are unable to accept mathematical explanations of natural phenomena