Three-year-old Tyson's grandmother is showing him her porcelain figurines. She asks him if he can tell her which one is the ballerina. Tyson points to a unicorn figurine. His grandmother tells him that figurine is a unicorn and points to the figurine of the ballerina. Tyson says, "No, grandma. That's a girl." This interaction illustrates ______.
A. logical extension
B. the mutual exclusivity assumption
C. overregularization
D. private speech
Answer: B
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