One of these things is not like the others. Can you figure out which one?

Karen is a resident in a psychiatric facility and appears to have no emotions at all

She just sits and stares blankly into space. When she speaks, she has no normal voice fluctuations. This example illustrates a. extreme elation. b. her delusional thought. c. her flat affect. d. depersonalization.

Which of the following skills is NOT an accomplishment of the concrete operational stage?

a. using concepts of time, space, and number b. abstract reasoning c. conservation d. reversibility