Four-Year-Old Dimitri Agrees That Two Rows of Nickels, Equally Spaced

Multiple Choice

Four-year-old Dimitri agrees that two rows of nickels, equally spaced, contain the same number of nickels. If the spacing increased between the nickels in one row, he thinks that row now has more nickels. Dimitri has not acquired the concept of

A) egocentrism.
B) conservation.
C) centration.
D) object permanence.