Which of the following is an example of an operational definition?

A) the amount of alcohol intake by a given individual each day
B) what a psychologist believes is the reason an individual drinks alcohol
C) asking individuals to determine whether there might be major changes in their lives in the near future
D) all of the above

Operational Definition

A specific, measurable definition used in research that outlines the procedures or criteria for identifying and quantifying variables.

Alcohol Intake

Alcohol intake refers to the consumption of alcoholic beverages and its measurement, often considered in relation to health effects and recommendations.

Psychologist

A professional who studies mental processes and behaviors by observing, interpreting, and recording how individuals relate to one another and to their environments.