In the United States from 2009 through 2018: A) national health expenditures as a percent of gross domestic product and per capita national expenditures have increased. B) national health expenditures as a percent of gross domestic product have remained relatively constant while per capita national health expenditures have increased C) national health expenditures as a percent of gross domestic product have increased while per capita national health expenditures have remained relatively constant. D) national health expenditures as a percent of gross domestic product and per capita national expenditures have remained relatively constant