Mrs. Brown's tomato-stained dress is a red herring, the pizza allergy is Mr. Poppy's alibi, and the empty pizza box and spicy breath are evidence. I say this because It wasn't Mrs. Brown because and the tomato stain is red herring because it was Mr. Poppy.
Sample Response: I predict that the thief will be another student and not one of the boys. I think the boys are red herrings who seem guilty. Once Ellery Queen questions more of the students, he will find a witness and determine that another student is to blame.