Final answer:
The most appropriate nursing intervention for an 8-year-old client crying with pain after a tonsillectomy is holding him and providing comfort.
Step-by-step explanation:
The most appropriate nursing intervention for an 8-year-old client crying with pain after a tonsillectomy is Option D: Hold him and provide comfort. After a tonsillectomy, the throat can be very sore and painful. Holding the client and providing comfort can help soothe their distress and make them feel secure. This intervention shows empathy and helps promote a sense of safety and trust. Options A, B, and C are not appropriate interventions. Telling the client he is too big to cry may dismiss his pain and emotions. Offering a Popsicle when he stops crying does not address his immediate needs for comfort and relief. Threatening to put him in his bed if he continues to cry may be perceived as punishment and can further distress the client.