Sentence 1: Jim and James went to the museum. 
 Sentence 3: Jim told James he did not believe in dinosaurs 
 Sentence 4:  James thought Jim was just playing with him 
 Sentence 5:  He was laughing at Jim and Jim got upset and left the museum 
 Option 1: The first exhibit they went to see was the dinosaur fossils. 
 Option 2: The first exhibit they went to see were the mummy's.