Commas in a Series

Which sentence is punctuated correctly? I like to put pepperoni mushroom and onion on my pizza. I like to put pepperoni, mushroom and onion on my pizza. I like to put pepperoni, mushroom, and onion on my pizza. I like to put pepperoni, mushroom, and onion, on my pizza. The child had a cough runny nose and upset stomach. Rewrite this sentence using the correct comma placement. Lion Tiger Jaguar Cheetah Write a sentence using all of the words listed above. Make sure you use commas when listing the items and don't forget capitalization and punctuation! Write a complete sentence listing your 3 favorite foods. Don't forget to use correct capitalization and punctuation.