The Results of Research Investigating the Impact of Practice on the Development

The results of research investigating the impact of practice on the development of motor skills indicates that

A) severely restricting a baby's movement slows down the acquisition of motor skills.
B) practice does not have any effect on the development of motor skills.
C) motor skills and language skills develop at the same pace.
D) short periods of restriction of a baby's movements slows down the acquisition of motor skills.