Sentence 1: Rob wanted a toy he saw on a commercial. 
 Sentence 3: He convinced his mother to buy the cereal 
 Sentence 4:  The box stated there were 6 toys in total 
 Sentence 5:  Rob ate the same cereal for a month to collect the 6 toys 
 Option 1: The toy only came in a box of pizza. 
 Option 2: The toy only came in a box of cereal.