A nurse is caring for a client with myasthenia gravis who is experiencing increased dyspnea and decreased oxygen saturation levels. Which of the following interventions should the nurse prioritize to improve this client's respiratory status?

Limit fluid intake to reduce the risk of aspiration.

Position the client's head of the bed at 15 degrees to encourage lung expansion.

Encourage the client to take deep breaths using incentive spirometry.

Administer bronchodilators as prescribed to manage bronchospasm.