2. Miss McClintock discovered that five of the children in her class were developmentally advanced. All of the students’ language skills were exploding! Although many of the students still had trouble sharing, a few appeared to understand that by sharing, everyone could be happy. Finally, there was even one child who could solve conservation problems. According to Piagetian theory, in what stage are the students in Miss McClintock’s class?

A. Formal operations B. Concrete operations C. Preoperational D. Sensorimotor