When some Canadian parents were asked to practice walking skills with their 6-week-old infants and other parents were asked to practice sitting skills with their infants, ______.
a. this practice made no difference because motor development is on a very strict developmental timetable
b. infants who practiced walking walked at an earlier age, but practice at sitting made no difference in when this happened
c. infants who practiced sitting sat at an earlier age, but practice at walking made no difference in when this happened
d. those trained in walking walked at an earlier age and those trained in sitting sat at an earlier age
Ans: D
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