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[单选题]Which of the following is an advantage of using formal experimental methods?emS答案窝(daanwo.com)-大学生作业答案及考资分享平台
AOnly these methods can find out whether there is any relationship between two variables.emS答案窝(daanwo.com)-大学生作业答案及考资分享平台
BOnly these methods allow behavior to be observed as it naturally occurs.emS答案窝(daanwo.com)-大学生作业答案及考资分享平台
COnly these methods allow researchers to determine people's opinions about various issues.emS答案窝(daanwo.com)-大学生作业答案及考资分享平台
DOnly these methods allow scientists to determine cause-and-effect relationships.
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