One of the Major Difficulties in Determining Whether an Older

One of the major difficulties in determining whether an older adult is suffering from a depressive disorder is

A) many people feel that it is normal for older people to be depressed.
B) older people don't want to admit that they feel depressed.
C) many older people experience higher levels of sadness, but not true depression.
D) other medical problems have similar symptoms to depressive disorders.
E) depressive disorders are not common among older adults.