In the figure below, which of the following is true? 
Definitions:
Cross-sectional
A research design that collects data from a population, or a representative subset, at one specific point in time.
Reasoning Ability
The capacity to think logically, understand and apply principles, and solve problems, often measured through cognitive tests.
Age
A measure of the length of time that a person or thing has existed, often used as a variable in research to examine differences or changes over time.
Longitudinal Study
An observational research method that involves repeated observations of the same variables over a period of time.
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