Which option is the proper in academic writing for "or" items (apples/pears/oranges):
- I am going to eat red apples or yellow pears or green oranges.
- I am going to eat red apples, or yellow pears, or green oranges.
- I am going to eat red apples, yellow pears or green oranges.
- I am going to eat red apples, yellow pears, or green oranges.