A Woman Gives Birth to a Baby That Is Five

A woman gives birth to a baby that is five weeks premature.The baby has trouble breathing on its own so the physicians put the baby on a respirator.The most likely reason for the baby's breathing problems is

A) a lack of a mucus in the airways that would make the airways slippery and easier to fill with air.
B) inactive cilia in the airways, making it difficult to clear trapped mucus in the airways.
C) insufficient surface tension in the lungs, making the lungs less elastic.
D) insufficient surfactant, making the surface tension in the alveoli too high to properly inflate.
E) an overabundance of surfactant, making the lungs too elastic and unable to hold air in the alveoli.