Disease X is incurable and terminal.  It is known that the i…

Disease X is incurable and terminal.  It is known that the incidence of Disease X has been constant during the past 30 years.  Researchers have determined that the prevalence of Disease X is higher today than it was 15 years ago.  Select the answer that best explains this observation: 

Disease X is incurable and terminal.  It is known that the i…

Disease X is incurable and terminal.  It is known that the incidence of Disease X has been constant during the past 30 years.  Researchers have determined that the prevalence of Disease X is higher today than it was 15 years ago.  Select the answer that best explains this observation: