Suppose a Researcher, Using a Cross-Sectional Design, Finds That the Incidence

Multiple Choice

Suppose a researcher, using a cross-sectional design, finds that the incidence of depression is highest among young adults and lowest among the elderly. Which of the following is a possible valid interpretation of this result?

A) It reflects a basic, shared biological change with age.
B) It reflects a shared, "age-graded" change resulting from common adult tasks and family life cycles.
C) It reflects cohort differences; current young adults experience more stress than the previous generation did.
D) any of the above.