A newborn presents immediately after birth with severe respiratory distress. Antenatal ultrasound showed severe oligohydramnios. Physical examination reveals flattened facies, low-set ears, limb deformities, and bilateral absence of kidneys on ultrasound. What is the primary cause of respiratory failure in this newborn?
A
Severe metabolic acidosis due to renal failure
B
Pulmonary hypoplasia caused by oligohydramnios
C
Congenital pneumonia due to intrauterine infection
D
Aspiration of amniotic fluid