Which one of the following can be considered as a contribution of Kohlberg's theory?

The correct answer is: His theory has supported an association between cognitive maturity and moral maturity.

Lawrence Kohlberg's theory of moral development posits that moral reasoning develops through a series of stages that are closely linked to cognitive development. Building upon Jean Piaget's cognitive development theory, Kohlberg demonstrated that higher levels of moral reasoning require higher levels of cognitive maturity.

As individuals mature cognitively, their capacity for abstract thought, perspective-taking, and logical reasoning expands, which directly enables them to navigate more complex moral dilemmas and progress to higher stages of moral development.