Which sentence uses a comma to separate two independent clauses?

Question

1. AJ likes butter, and jelly on toast.
2. I need carrots, beans, and potatoes.
3. It's a great day to fly a kite because it is warm, and sunny.
4. Stu likes cake, but i like brownies.

Answer 1

3. It's a great day to fly a kite because it is warm, and sunny.