Which of the following cognitive abilities are characteristic of a school-aged child in Piaget's concrete operational stage? (select all that apply)

The correct answers are C and D. In Piaget's concrete operational stage, children develop the ability to perform logical operations on concrete objects (choice C) and understand the concept of conservation (choice D). This means they can manipulate objects mentally and understand that quantity remains the same despite changes in appearance. Object permanence (choice A) is a sensorimotor stage milestone. Egocentric thinking (choice B) is characteristic of the preoperational stage. The use of symbolic play (choice E) is more related to the preoperational stage as well. Therefore, choices A, B, and E are incorrect for a school-aged child in Piaget's concrete operational stage.