6.1-6.2 Researchers hypothesize that the older a baby is when it begins to crawl, the longer it will take the baby to stop exhibiting earlier rocking behaviors. The researchers go into the infant room of a day care center every day for six weeks. Every time a baby rocks, the researchers record it. They document which babies are already crawlers and at what age each started crawling. What will help the researchers with their investigation?A) sharing the researcher's hypothesis with parents before the study begins B) surveying 100 parents about prenatal careC) their knowledge that babies develop fine motor skills before they develop gross motor skills D) their knowledge that rocking behavior develops before crawling behavior and that rocking behavior eventually goes away once crawling behavior begins E) randomly assigning the babies to crawling versus not-crawling conditions

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