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.