A teacher shows a first-grade student a map and tells her, "You live here, in Calgary, Alberta." The child emphatically disagrees, declaring, "No, I live in Calgary. I can't live in Alberta too...

A teacher shows a first-grade student a map and tells her, "You live here, in Calgary, Alberta." The child emphatically disagrees, declaring, "No, I live in Calgary. I can't live in Alberta too because I can't live in two places at the same time!" This child is likely in Piaget's ________ stage of development.