An integrated understanding of successful aging in terms of appropriate nutrition,family support,and an optimistic outlook is most clearly provided by

A) a cross-sectional study.
B) a longitudinal study.
C) a biopsychosocial approach.
D) an evolutionary perspective.

Biopsychosocial Approach

A framework that attributes complex phenomena or illnesses to the interaction of biological, psychological, and social factors.

Cross-Sectional Study

A type of observational research that analyzes data from a population, or a representative subset, at a specific point in time.

Longitudinal Study

A research design that involves repeated observations of the same variables over a period of time, often used to observe developments or changes.