Based on the Findings of a Study by Robert Cooper

Based on the findings of a study by Robert Cooper (1984) , what is the earliest evidence that young children have the fundamental ability to represent numerical relations?

A) 10-month-old infants dishabituated to the "less than" condition only
B) 10-month-old infants dishabituated to the "equal to" condition only
C) 10-month-old infants dishabituated to the "more than" condition only
D) 14-month-old infants dishabituated to all three conditions
E) 14-month-old infants habituated to the "equal to" condition only