Answer :
Final answer:
The word 'stereotype' fits the definition of a fixed idea about a group that might be unfair or untrue. It is exemplified by Anne Garrett challenging the stereotype about older individuals not exercising.
Explanation:
Stereotype refers to a fixed idea about a group that may be unfair or untrue. In the context provided, the word that fits this definition is stereotype. It represents a preconceived and oversimplified belief about a particular group of people.
For instance, when American runner Anne Garrett set a national record for the half-marathon at age eighty, she defied the stereotype that older individuals don't engage in vigorous activities like running. This showcases how stereotypes can be challenged and broken.
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