10) D

1 – Wrong
If they were innately more intelligent, then it perfectly explains why they improve more between ages 11 and 16 than boys.

2 – Wrong
If girls mature earlier than boys, then that also explains why girls improve more at ages 11 and 16 than boys.

3 – Wrong
This also explains why girls improve more academically than boys.

4 – Correct
The question clearly says “for all ethnic groups”. Whether Asian girls improve more or not does not matter and is irrelevant.

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