关于开放式问题说法正确的是The correct statement about open-ended questions is that()
A.用于设置事先不知道答案的问题they are used to set up questions that do not know the answer in advance B.开放式问题可将不相干的回答减少到最低程度 open-ended questions can minimize irrelevant answers C.容易回答,文化程度较低者也能完成they are easy to answer, even those with lower education level can complete D.开放式问题便于统计分析处理open-ended questions facilitate statistical analysis and processing