Final answer:
Option C indicates the need for additional instruction because people with asthma should be encouraged to exercise with proper guidance, not limit it.
Step-by-step explanation:
The correct answer to the question is option C: "I need to limit my exercise, especially activities such as walking and running." This statement indicates a need for additional instruction for the client with asthma. Regular monitoring of peak flow is essential for managing asthma, as it helps in detecting any decline in lung function (A). Contacting the clinic if medication usage increases can imply a worsening of asthma control, which is a critical part of self-management (B). Learning stress reduction and relaxation techniques is beneficial, as stress can be an asthma trigger (D). However, people with asthma are encouraged to stay active and exercise, with proper guidance and precautions, since it can improve lung function and overall health.