问题详情
Howdidtheresearchersensurethattheirfindingsarevalid?
A.yattachingequalimportancetoallpossiblevariablesexamined
B.ycollectingasmanytypicalsamplesaswerenecessary
C.ypreventingthemfrombeingaffectedbyfactorsnotunderstudy
D.yfocusingonthefamilybackgroundofchildrenbeingstudied
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