An experiment designed to test proof of concept is an example of

Daryl is 8 years old and he likes to do art projects at school. However, the projects he has completed so far haven't received good grades, and in several instances his friends have laughed at the things he has done

Based on Erikson's theory, Daryl may develop: a) feelings of inferiority. b) a sense of despair. c) feelings of guilt. d) a sense of isolation.

According to Piaget, children begin to develop concepts and the ability to think in terms of abstractions in the ______ stage

a. preoperational c. concrete-operational b. formal-operational d. sensory-motor