Which of the Following Provides One Explanation for Why Medicare

Which of the following provides one explanation for why Medicare costs have risen in recent years?

A) People now are in better health than were people in the past.
B) People rely on their own private insurance to supplement Medicare.
C) Most people on Medicare also receive Medicaid benefits.
D) Doctors charge less for many services than they did in the past.
E) People live longer today than they did in the past.