How would each of the following changes affect the demand curve for acupuncture?

a) The price of an acupuncture session increases.

b) A reduction in back problems occurs as a result of sessions on stretching on a popular television show.

c) Medicare reduces the co-payment for acupuncture from $20 to $10.

d) The surgeon general issues a warning that back surgery is ineffective.

e) Medicare stops covering back surgery.