Which of the Following Is True About the Concrete Operational

Which of the following is true about the concrete operational stage of reasoning?

A) Adolescents can conceive of hypothetical possibilities in this stage.
B) This stage denotes ability of an adolescent to systematically deduce, or come to a conclusion about, the best path for solving the problem.
C) A kind of abstract, logical reasoning occurs in this cognitive stage.
D) One important skill at this stage of reasoning is the ability to classify or divide things into different sets or subsets and to consider their interrelations.