Which Child Appears to Have Mastered the Cardinality Principle

Multiple Choice

Which child appears to have mastered the cardinality principle?

A) Kelsey, who always counts three cars as "1, 2, 3."
B) Casey, who consistently counts three cars as "10, 9, 8."
C) Jenny, who sometimes counts three cars as "1, a, 2,B"
D) Haley, who counts three cars as "1, 5, 6...SIX CARS!"