Choice A rationale:

Administering oxygen therapy is essential in cases of severe croup where the child has difficulty breathing.

Oxygen therapy helps ensure adequate oxygenation, which is crucial in managing respiratory distress.

Choice B rationale:

Positioning the child upright facilitates breathing by allowing the airways to remain open and reducing airway obstruction.

This position helps alleviate symptoms like stridor and allows the child to breathe more comfortably.

Choice C rationale:

Providing humidified air helps loosen secretions and makes it easier for the child to breathe.

Humidification can reduce airway irritation and soothe the inflamed throat, providing relief from croup symptoms.

Choice D rationale:

This choice is incorrect because encouraging the child to drink plenty of fluids is generally good advice for any illness but is not specific to croup.

While it is essential to keep the child hydrated, it is not a direct nursing intervention for managing croup symptoms.

Choice E rationale:

Monitoring the child's respiratory status closely is crucial in assessing the effectiveness of the interventions and identifying any signs of respiratory distress.

Close monitoring allows nurses to make timely decisions and take appropriate actions to maintain the child's respiratory function.