Add the correct hyphen(s) or dash(es) to the below sentence:
She has stopped buying 2 liter bottles and has started buying 0.5 liter bottles, instead.
No change necessary.
She has stopped buying 2—liter bottles and has started buying 0.5—liter bottles, instead.
She has stopped buying 2-liter bottles and has started buying 0.5-liter bottles, instead.
She has stopped buying 2 liter bottles and has started buying 0.5 liter bottles - instead.