Which of the Following Research Strategies Showed That Piaget's Estimates

Which of the following research strategies showed that Piaget's estimates of children's moral reasoning were wrong?

A) researchers clearly separated actors' actions from the outcomes of those actions
B) researchers read children stories about the moral situations instead of requiring the children to read them themselves
C) researchers adapted the moral scenarios to incorporate situations more familiar to the children
D) researchers used a force-choice answer strategy instead of allowing the children to provide open-ended answers