Correct Answer: A

Rationale: Screening for visual acuity helps identify children who may need corrective lenses or other interventions.

Correct Answer: B

Rationale: Tertiary prevention focuses on managing and improving health outcomes for existing conditions, such as diabetes.

Correct Answer: C

Rationale: The correct answer is women aged 40-50. This age group is at an increased risk for breast cancer and should be the primary target for screening campaigns. Women in this age range are more likely to benefit from regular screening as early detection can lead to better outcomes. Choices A, B, and D are incorrect because women aged 20-30 are generally not recommended for routine screening due to their lower risk, women aged 30-40 have a moderate risk but are not the primary target group, and women aged 50-60 should still be screened but targeting the 40-50 age group is more crucial for early detection and intervention.

Correct Answer: B

Rationale: Exploring the client's dietary habits and challenges helps the nurse understand the barriers to maintaining a healthy diet and tailor the intervention accordingly.

Correct Answer: A

Rationale: A respiratory rate of 20 breaths per minute indicates effective oxygen therapy. In pneumonia, the respiratory rate typically increases due to the body's effort to improve oxygenation. Option B (pH of 7.35) is related to acid-base balance, not specifically indicating oxygen therapy effectiveness. Option C (oxygen saturation of 92%) is below the normal range (95-100%), suggesting the need for oxygen therapy. Option D (clear breath sounds) is a positive finding but not a direct indicator of oxygen therapy effectiveness.