In Middle Childhood, Children Show Great Advances in Motor Skills

In middle childhood, children show great advances in motor skills. This is due to increased muscle strength and

A) increased myelination of the pathways between the cerebellum and the cortex.
B) maturation of the amygdala.
C) improvement in the functioning of the occipital lobe, which increases visual acuity.
D) parental pressure to perform well in sports.