Only One of the Following Conclusions Can Be Derived from Recent

Only one of the following conclusions can be derived from recent research regarding Piaget's theory of cognitive development. Which one?

A) Middle school and secondary school students typically have an easier time thinking logically in the social sciences than they do in the physical and life sciences.
B) Children will think more logically about a topic when they have acquired relevant knowledge and experiences related to the topic.
C) Many young people continue to show signs of preoperational thinking until well into the high school years.
D) Children have an easier time understanding fractions and proportions in adolescence if such concepts are first introduced at the same time that division is introduced e.g., in third grade) .