Am I right? Which sentence is written correctly?

Add a little butter to the pan--you could use olive oil as a substitute, if you like--.

Add a little butter to the pan, you could use olive oil as a substitute, if you like.

Add a little butter to the pan [you could use olive oil as a substitute, if you like].

Add a little butter to the pan (you could use olive oil as a substitute, if you like).<<<<<<This is my answer

Thank you for checking my answer:)

Which is your answer? The last one?

Yes, it is the last one.

Yes, that's correct.

You're welcome.

Your answer is correct! The sentence "Add a little butter to the pan (you could use olive oil as a substitute, if you like)." is written correctly. The use of parentheses in this sentence is appropriate to indicate optional information or an additional suggestion.