A 1-year-old with suspected intussusception presents with HR 178, BP 72/38, RR 44, T 38.5°C.The abdomen is distended, and the child is lethargic. What is the priority action?

Apply warm compresses to abdomen to decrease pain

Prepare for urgent pneumatic (air) enema reduction

Administer oral rehydration solution (ORS) to treat dehydration

Place child in Trendelenburg position to decrease swelling in the gastrointestinal tract