Compared to 50 Years Ago, the Average Life Expectancy for Individuals

Compared to 50 years ago, the average life expectancy for individuals who have intellectual or developmental disabilities is:

A) much longer, approaching a near-normal lifespan for most such people
B) slightly longer, but still considerably less than a normal lifespan
C) about the same as it was 50 years ago
D) slightly shorter, owing to more infants who today are born alive but die in infancy