Which of the following sentences 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).

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

Explanation: Commas and periods are the only necessary punctuation.

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

Explanation:

The line "you could use olive oil as a substitute, if you like" is an added fact or an option, so we would put that in brackets.

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