Correct Answer: A

Rationale: Creating a school-based exercise program directly targets increasing physical activity among children, which is essential in preventing obesity.

Correct Answer: B

Rationale: Impaired gas exchange is the highest priority nursing diagnosis because it directly impacts the client's oxygenation. Following coronary artery bypass graft surgery, ensuring adequate oxygen exchange is crucial for the client's recovery. Ineffective breathing pattern, although important, may not be as critical as impaired gas exchange in the immediate postoperative period. Acute pain, while significant, can be managed effectively with appropriate interventions and is not as emergent as addressing impaired gas exchange. Risk for infection is also a valid concern post-surgery, but ensuring optimal gas exchange takes precedence to prevent complications associated with inadequate oxygenation.

Correct Answer: C

Rationale: Reminding parents about the second dose ensures that children receive the complete vaccination on time.

Correct Answer: C

Rationale: Atenolol, a beta-blocker, should be administered because the client's apical pulse is greater than 60.

Correct Answer: A

Rationale: The 45-year-old father who smokes and has high cholesterol should be prioritized for further evaluation and intervention. He has multiple risk factors for cardiovascular disease, including smoking and high cholesterol, which significantly increase his risk. Addressing these modifiable risk factors is crucial in preventing cardiovascular events. The daughter (Choice B) and mother (Choice C) also have risk factors, but the father's combination of smoking and high cholesterol places him at higher immediate risk, demanding priority intervention. The 12-year-old son (Choice D) with a normal weight and an active lifestyle has a lower risk profile and does not require immediate intervention compared to the father.