With Regard to a Pregnant Woman's Anxiety and Pain Experience,nurses

With regard to a pregnant woman's anxiety and pain experience,nurses should be aware that:

A) even mild anxiety must be treated.
B) severe anxiety increases tension, which increases pain, which in turn increases fear and anxiety, and so on.
C) anxiety may increase the perception of pain, but it does not affect the mechanism of labor.
D) women who have had a painful labor will have learned from the experience and have less anxiety the second time because of increased familiarity.