75-Year-Old Mrs

Multiple Choice

75-year-old Mrs. A. has difficulty with her vision due to cataracts but her friend Mrs. B., also 75, can see perfectly. However, Mrs. B.'s arthritis makes it difficult for her to walk while Mrs. A. recently ran a senior marathon. This example illustrates which principle of adult development and aging?

A) Interindividual differences.
B) Normal aging is different from disease.
C) Survivors are an increasingly select group.
D) Changes are continuous over the life span.