It Is Difficult to Define the Developmental Tasks of Old

It is difficult to define the developmental tasks of old age because

A) as people age, their functional age may be more important than their chronological age.
B) as life expectancy increases, the stage of old age keeps getting longer.
C) as people age, they become more alike instead of demonstrating individual developmental characteristics.
D) their functional age may be more informative, and the stage of old age keeps getting longer.