Christopher Suffers from a Terrible Illness That Has Rendered Him

Christopher suffers from a terrible illness that has rendered him unable to care for himself, to hold a job, or to live independently. He is only 32 years of age. Reevis is a 70-year-old college professor who has considered retirement but thinks that it is still three or four years away. Which of the following statements is the MOST accurate regarding these two gentlemen?

A) Christopher has a shorter average life expectancy than Reevis.
B) Christopher has a shorter longevity than Reevis.
C) Christopher has a shorter useful life expectancy than Reevis.
D) Christopher will have a shorter maximum life expectancy than Reevis.