Research shows that all couples who have made the childfree choice are equally committed to remaining childfree.

The answer in this statement is false. It is because couples who made the decision of child free doesn't mean that they are committed of having to chose this choice as their are some reasons as to why other couples decided to chose this and it could be because of circumstantial reasons where in it does not mean that they are equally committed with having a child free choice and it could depend on the reasons that they have.