The concept of maturation is most relevant to understanding the absence of

The correct answer should be - bladder control among 2-year-olds.

If a child still cannot control his or her bladder at the age of 2, it means that he or she still hasn't matured enough to do that. The other options are incorrect because you can be mature, and still feel secure around your family, or still lack self-esteem, or lack schemas at a particular age.