In Stanley Milgram’s’ classic study, a participant was placed in one room and a confederate was placed in another room where the participant could not see the confederate. Participants were told to shock the confederate when the confederate answered a question incorrectly. What was a major ethical violation of Milgram's study?

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities