An article discusses the benefits of daily exercise, citing a study where participants who walked 30 minutes a day for six months showed improved cardiovascular health and reduced stress levels. What kind of evidence does the article primarily use to support its claims?

The correct answer to the question "An article discusses the benefits of daily exercise, citing a study where participants who walked 30 minutes a day for six months showed improved cardiovascular health and reduced stress levels. What kind of evidence does the article primarily use to support its claims?" is Option D: Empirical evidence.

The other options — A) Anecdotal evidence, B) Expert opinion, C) Statistical data — are incorrect for this GED Exam Prep question. As explained above: Empirical evidence is information gained by observation or experimentation. A study with participants showing measurable health improvements is a direct example of empirical evidence.