How Did the Research Methods Employed by Kohlberg and Piaget

How did the research methods employed by Kohlberg and Piaget differ?

A) Kohlberg asked children to reason about whether it is better to obey a law or break a law for the benefit of an individual, while Piaget presented children scenarios in which they were to evaluate who was naughtier.
B) Piaget used a longitudinal research design, while Kohlberg used a cross-sectional design.
C) Kohlberg asked youths and adults to reason about contemporary social problems, while Piaget asked about hypothetical dilemmas.
D) Kohlberg studied girls while Piaget included only boys in his samples.