DeLoache and Her Colleagues Have Studied Preschoolers' Understanding of Maps

DeLoache and her colleagues have studied preschoolers' understanding of maps and scale models. In their research, preschoolers' inability to think about small Snoopy as being both a symbol for big Snoopy and as an object in itself is similar to

A) the inability for a non-conserver to think about height and width of a beaker simultaneously.
B) the inability of a preschooler to think about a red wooden bead as being simultaneously both red and wooden in the class inclusion problem.
C) the inability of a preschooler to think about "Stick A" as being simultaneously both bigger and smaller than other sticks in a seriation problem.
D) All of the alternatives are correct.