During Class, a Nursing Student Asks, "I Read an Article

During class, a nursing student asks, "I read an article that was talking about integrative medicine. What is that?" Which response by the instructor would be most appropriate?

A) "It refers to the use of complementary and alternative medicine in place of traditional therapies for a condition."
B) "It means that complementary and alternative medicine is used together with conventional therapies to reduce pain or discomfort."
C) "It means that mainstream medical therapies and complementary and alternative therapies are combined based on scientific evidence for being effective."
D) "It refers to situations when a client and his or her family prefer to use an unproven method of treatment over a proven one."