In a Discussion About the Benefits of Exercise on Health

In a discussion about the benefits of exercise on health, someone says, "Exercise is not always good for you, because I know a guy from my town who used to run 3 miles a day and then died at age 45 of a heart attack." In this argument, which type of evidence is used and what is its limitation?

A) A testimonial (personal experience) that is subject to illusion and bias
B) An anecdote that may be unique, not repeatable, and not generalizable
C) A commonsense belief that may be prevalent but not necessarily true
D) A statement of authority that is not based on actual expertise or knowledge