In French, to talk about "Arthur et Françoise," you would use the subject pronoun "ils." However, since "ils" is not one of your options, it seems like there might be a misunderstanding. None of the options provided (oils, elles, nous, vous) are correct for "Arthur et Françoise." The correct answer should be the masculine plural pronoun "ils," as Arthur is a male and Françoise is a female, but together they would still be referred to as "ils."
If you must choose from the provided options, you might want to clarify what each option is intended to signify.