According to MLA citation rules, the correct option is the first one “Romans ate together, reclining on couches while eating with their right hands (Phin 429).”
When adding a citation of a summary following MLA rules, you need to paraphrase the original text using your own words, and then you need to include in parenthesis the name of the author and the page number. In the examples provided, only the first option includes paraphrasing, author name and page number.