Final answer:
The right ventricle is underdeveloped in tricuspid atresia. Surgical interventions are needed to redirect blood flow.
Step-by-step explanation:
In tricuspid atresia, the correct option is c) The right ventricle is underdeveloped. Tricuspid atresia is a congenital heart defect where the tricuspid valve, which regulates blood flow between the right atrium and ventricle, is completely closed or underdeveloped. This causes the right ventricle to be underdeveloped. In this condition, blood flow bypasses the lungs, leading to cyanosis (bluish skin coloration) and the need for surgical interventions such as the Fontan procedure to redirect blood flow.