Correct Answer: D

Rationale: Tertiary prevention aims to reduce the impact of a disease or disability, such as through physical therapy post-injury.

Correct Answer: B

Rationale: Beta-blockers like metoprolol can alter heart rate response, limiting its usefulness as a measure of exercise intensity.

Correct Answer: C

Rationale: Healthy People 2020 focuses on providing a framework for prevention.

Correct Answer: A

Rationale: Encouraging behavior changes such as smoking cessation has the potential to significantly improve public health and reduce chronic disease.

Correct Answer: B

Rationale: Screenings provide an opportunity for health education, helping to promote preventive health measures.