Which statement is true? a. the increased diversity of the college atmosphere encourages cognitive development. b. since many students drop out of college, estimating the effect of college education on cognitive development is complicated. c. diversity has decreased the long-term effects of a college education d. a college education had more positive effects on cognitive development in the past than today.

A). The increased diversity of the college atmosphere encourages cognitive development.

Explanation:

Cognitive development is illustrated as the development of thinking abilities and the acquisition of knowledge, skills, understanding, and other mental developments. Jean Piaget described this theory in four stages that contribute to the development of a child's brain into an adult brain. As per the given description, the statement that is true regarding 'cognitive development' would be option first and i.e. "The increased diversity of the college atmosphere encourages cognitive development" as diversity would instill/impart learning and growth into the students. Therefore, the statement given in option A is true.

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