Even 3- and 4-Year-Old Children Can Solve the Conservation-Of-Number Task

Even 3- and 4-year-old children can solve the conservation-of-number task (where one row of objects is more spread out than another row with an equal number of objects) using eight items if

A) the items are different colors for the two rows.
B) the items used are objects that the child is familiar with.
C) the items used are objects that the child is unfamiliar with.
D) the child is given extensive practice doing the task with few items.