Which of the Following Statement(s) Is(are) True of Denture Soft

Which of the following statement(s) is(are) true of denture soft liners?

A) They may be used for patients with severe undercuts of the edentulous ridges.
B) Silicone liners harden as time passes, because they contain plasticizer.
C) The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids.
D) A, B, and C are true statements.
E) A and C are true statements.