The Demand for a Good or Service Rises If at Every

The demand for a good or service rises if at every price people are willing and able to purchase more than they did previously. The reason that the demand for health care has risen is that

A) the third-party payment system has increased people's willingness to purchase more.
B) the third-party payment system has increased people's ability to purchase more.
C) the price of health care has fallen due to technological change.
D) the quality of health care has risen.
E) the price of health care has fallen while the quality has risen.