Which of the following sentences uses commas correctly?

I had eggs, toast, and orange juice for breakfast.

I had eggs, toast and orange juice for breakfast.

I had eggs toast and orange juice for breakfast.

I had eggs, toast, and orange juice for breakfast.

I had eggs toast, and orange juice for breakfast.

Commas - English Grammar Rules & Examples

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A comma is a small mark ( , ) that breaks a sentence into easier parts.

Between list items to separate things in a list (e.g., apples, bananas, oranges).
Before and/or/but when joining two full sentences (e.g., I went home, but it rained).
After introductory words like Well or However (e.g., Well, I’m not sure, but let’s try).

Use commas to:

To separate three or more words in a list (makes your sentence neat)
Join two short sentences with and or but (avoids run-on sentences)
Set off words like however or well at the start (shows your thinking time)