Commas in a Series

Pick which sentence with commas in a series is written correctly. I ate cake, pie and cookies. I ate cake pie and cookies. I ate cake, pie, and cookies. I had a pet dog, cat, and hamster. I had a pet dog, cat and hamster, I had a pet dog cat and hamster. Mom made me go to the store the park and the zoo. Mom made me go to the store, the park, and the zoo. Mom made me, go to the store, the park and the zoo. At the zoo we saw a zebra giraffe, and hippo. At the zoo, we saw a zebra giraffe and hippo. At the zoo we saw a zebra, giraffe, and hippo. We will have cake, ice cream, and soda at my party. We will have cake, ice cream and soda at my party. We will have cake ice cream and soda, at the party. I packed my pencil scissors and notebook. I packed my pencil, scissors and notebook. I packed my pencil, scissors, and notebook. The windows, floor, and sink need to be cleaned. The windows floor, and sink need to be cleaned. The windows floor and sink, need to be cleaned. I lost my red orange and yellow crayons. Type this sentence with the necessary commas correctly. We saw seagulls shells and a turtle at the beach. Type this sentence with the necessary commas correctly. Baseball basketball and football are my favorite sports to watch on TV. Type this sentence with the necessary commas correctly.