Professor Kuilema compared the moral intuitions of one group of children,a second group of adolescents,and a third group of adults by assessing their reactions to a variety of moral dilemmas.Professor Kuilema conducted a ________ study.

A) longitudinal
B) social clock
C) cross-sectional
D) neurogenesis

A cross-sectional study involves comparing groups of individuals at different ages or stages of development at the same time. In this case, Professor Kuilema compared the moral intuitions of different age groups (children, adolescents, and adults) at the same time. A longitudinal study would involve following the same individuals over a period of time to track changes in their moral intuitions. Social clock and neurogenesis are not relevant to this type of study.