Which Statement Is Correct Concerning Salivary Flow

Which statement is correct concerning salivary flow?

A) The prosthesis is considered a foreign object and can cause the salivary glands to produce excessive saliva.
B) Physical conditions such as medications and radiation treatment can also increase the amount of saliva produced.
C) The lack of saliva can make it difficult for a patient to wear a prosthesis.
D) All of the above are correct.