Aiden's Parents Consistently Placed Him on His Tummy Whenever He

Aiden's parents consistently placed him on his tummy whenever he went to sleep. Gertrude, on the other hand, was consistently placed on her back. Based on the findings from the Back-to-Sleep campaign, it is likely that

A) both infants will reach developmental milestones related to related to rolling over, sitting, and crawling around the same time.
B) Aiden will likely be delayed compared to Gertrude in reaching milestones related to rolling over, sitting, and crawling.
C) Gertrude will likely be delayed compared to Aiden in skills related to related to rolling over, sitting, and crawling.
D) because neither infant was able to experience both types of sleeping positions, both are likely to show delays in reaching basic motor milestones.
E) None of the above: Sleep position has no impact on development.