Donaldson Did Two Variations on Piaget's Number Conservation Task with Two

Donaldson did two variations on Piaget's number conservation task with two rows of objects.In one variation, the clumsy experimenter pretends to slip and accidentally change the length of one of the rows.In a second version, the child sees a naughty teddy bear change the length of one of the rows.Which of the following is true of these variations on the number conservation task?

A) Preschoolers are likely to fail all three of these versions of the number conservation task.
B) Preschoolers are more likely to succeed on the naughty teddy bear task than both the clumsy experimenter task and traditional number conservation task.
C) Preschoolers are more likely to succeed on the clumsy experimenter task than both the naughty teddy bear task and traditional number conservation task.
D) Preschoolers are more likely to succeed on both the naughty teddy bear task and clumsy experimenter task than the traditional number conservation task.