OG详解-OG9 文法 Q30

Choice B is the best answer. The sentence presents both the study and its methodology (that is, the researcher’s approach to the problem), explaining that Yuan used computer simulations to study the effect of the mother duck’s wake on the ducklings’ energy expenditure. 
Choice A is incorrect. The sentence describes the findings of Yuan’s study; it doesn’t present the study and its methodology. Choice C is incorrect. While the sentence provides general information about Yuan’s study, it doesn’t present the study’s methodology. Choice D is incorrect. The sentence describes the findings of Yuan’s study; it doesn’t present the study and its methodology.