As Blood Is Pumped into the Arterial Trunks Past the Semilunar

Multiple Choice

As blood is pumped into the arterial trunks past the semilunar valves,it

A) pushes against the cusps,forcing the valves open.
B) pushes against the cusps,forcing the valves closed.
C) fills the cusps,causing them to expand and block the backflow of blood.
D) fills the cusps,causing them to expand and open up for the flow of blood.
E) None of these answers is correct.