为什么B不对？

lala

2. Dr. Sheila Porter plans to run an experiment using nursing students. Each student will be shown either a pleasant nature film or a disturbing horror film. Each student will be observed by someone who—looking only at the student’s facial expressions—must ascertain which film is being shown. Students shown the horror movie are told to hide their feelings in order to convince the observer that they are watching a pleasant film. Dr. Porter hypothesizes that all the students in the experiment who are convincing will be among the best at working with patients. The hypothesis will be tested by comparing the convincing students and unconvincing students in terms of their perFORMance with patents.
Which one of the following incidents best illustrates Dr. Porter’s hypothesis?
(B) After graduating, Yoshiro, a nursing student who was convincing in the experiment, helped care for Bram, a patient at a hospital. Bram recovered from his operation.
(D) Daria, a nursing student who was convincing in the experiment, later received “A’s” in those classes in which working with patients in a teaching hospital was the sole basis of her grades.
选D。为什么B不对。

tongxun

lala：实验的目的是为了得出以下的假论：all the students in the experiment who are convincing will be among the best at working with patients.
但如何来检验护士是否是“best ”呢？用的是students in terms of their perFORMance with patents. 就是说“performance”，只有且惟有D选项给出了“performance”at working with patients。