参考答案

正确答案：B
解析：细节题。原文中有这么一句：When research is assigned，the professor expects the students to take tile initiative and to complete the assignment with minimal guidance，即教授希望学生能发挥主动性，完成作业时尽量少指导，选项A与此同义，through their own efforts(通过个人的努力)是take the initiative(发挥主动性)的同义转述。