Jessica Has Mastered Addition and Subtraction with Two- and Three-Digit

Jessica has mastered addition and subtraction with two- and three-digit numbers. She still struggles to understand more general mathematical rules, such as the fact that multiplying a number by -1 will always yield a negative number. She is likely in the _______ stage of cognitive development.

A) concrete operational
B) formal operational
C) preoperational
D) sensorimotor

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