Why Is Human Blood Clotting Factor VIII Produced by Genetically

Why is human blood clotting factor VIII produced by genetically engineered bacteria better to treat hemophilia type A than the clotting factor isolated from human or animal blood?

A) Recombinantly produced clotting factor has a longer shelf life than natural clotting factor.
B) Clotting factor isolated from blood can transmit infectious agents present in the donated blood.
C) Clotting factor isolated from human blood is quickly degraded.
D) Recombinantly produced clotting factor is stable at high temperatures.
E) Clotting factor from blood has a lower activity than recombinant clotting factor.