I think I understand the question.
The possibility of multiple responses is not unique to this question. There are several other questions like that. There may be situations where there is more than one answer. The question is how we deal with this and how it relates to the situation of the rights holders.
As soon as someone answers that they speak French, we use that as data. It's counted. So we use an order to determine whether the answer will be counted or not. When there are several answers to a question, if one of the answers is French, that counts as one of the characteristics.