The representative sample contained more girls than boys.
The point of a representative sample is to imitate the original population and not duplicate it. It is a more small scale representation of the original study.
With this in mind the first answer choice is wrong because it duplicates the original.
Since the representative sample imitates the original it needs to have the same properties as the original ,in this case there were more girls than boys, the second answer is also wrong.
The third one is correct because it had the same criteria as the original (more boys that girls).
The fourth one is wrong for the same reason as the second answer choice. It doesn’t fit the criteria.