Generally speaking, when are most children able to balance on a beam and pedal a bicycle?

Generally speaking, when are most children able to balance on a beam and pedal a bicycle?
 
  a. About age 3 or 4
  b. About age 6 or 7
  c. It depends upon how much practice they get using these skills.
  d. There is too much variability between children to say for sure.

Question 2

If Tori is a proponent of dynamic systems theory, then you know that she is most interested in
 
  a. the cerebral cortex.
 b. balance and moving limbs.
  c. language development.
 d. temperament.

Question 3

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.