Which of the Following Is True of Long-Term Soft Liners

Which of the following is true of long-term soft liners for complete and partial dentures?

A) Long-term liners may not be processed with the application of heat.
B) Silicone long-term liners are less stable over the long term than acrylic long-term liners because they have softeners that leach out.
C) Silicone liners are easy to adjust.
D) Long-term soft liners often do not form a good bond to old acrylic.