Lives in Context Video 4.2: Motor Development in InfancyClick on the above link to access the Interactive eBook. Once you've signed in, scroll to page 139 and watch the video. When you've finished watching the video, come back to the test and answer the following question:Marlee cannot yet roll over from her back to her stomach. According to your textbook, at about what age do babies reach this milestone?
A. 7 months
B. 10 months
C. 1 year
D. 14 months
Answer: A
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