Final answer:
The term used to describe something that can measure quality of life is an Indicator, which helps evaluate aspects of well-being and can indicate changes over time. The correct answer is A).
Step-by-step explanation:
The term for a behavior, event, or object that can help measure quality of life is A) Indicator. An indicator provides a way to quantify and evaluate aspects of life that contribute to well-being and can be tracked over time to assess changes in quality of life. Social indicators used to measure the level of a nation's development often include literacy rate, life expectancy, and infant mortality rate. Such indicators help in determining the effectiveness of policies and the overall condition of a society's standard of living.