Choice A rationale:

Administering aspirin for pain relief is contraindicated in clients with dengue fever due to its anticoagulant properties, which can further increase the risk of bleeding.

Choice B rationale:

While encouraging ambulation is generally beneficial for improving circulation in various conditions, it is not a suitable intervention during the critical phase of dengue fever when the client is experiencing severe plasma leakage and reduced platelet counts, which can lead to significant bleeding complications.

Choice C rationale:

Transfusion of blood products, such as platelets and packed red blood cells, may be necessary in clients with dengue fever who have severe thrombocytopenia and hematocrit elevation. Platelet count below 100,000/mm3 is a common threshold for initiating platelet transfusion in dengue fever to prevent bleeding complications, and a 25% increase in hematocrit from baseline indicates hemoconcentration, which may necessitate red blood cell transfusion.

Choice D rationale:

Monitoring SpO2 (oxygen saturation) and ABGs (arterial blood gases) regularly is important for assessing respiratory status in various conditions. However, during dengue fever, the more critical concern is the risk of bleeding and plasma leakage, making transfusion of blood products a higher priority intervention.