The pulmonary semilunar valve prevents blood from reentering the

A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
E) pulmonary trunk.

The pulmonary semilunar valve is located between the right ventricle and the pulmonary trunk, and it prevents blood from flowing back into the right ventricle during ventricular relaxation. Options A, B, D, and E are incorrect because the pulmonary valve is not involved in preventing blood reentry to these areas.