The correct answer is D) ageist.
The practice of discounting the years of late adulthood when calculating quality-adjusted life-years is "ageist."
Ageism is a form of discrimination that affects many people considered to be elders. Society has created a type of stereotype of elder people making them believe that they are useless to society, that their best years had passed. And that is completely wrong. Adult people of 60 or more years are people with enough experience to do many things in society, both in professional life or in the family environment.