Which Cultural Practice Is Associated with an Advance in Early

Which cultural practice is associated with an advance in early motor development by about 2 to 3 months?

A) Some West African mothers putting babies in holes in the ground in a sitting position.
B) Chinese mothers placing infants on beds surrounded by pillows.
C) Ache mothers from Paraguay carrying infants everywhere until they are about 3 years old.
D) Some traditional mothers wrapping infants in cloth for most of their first year.