What Was the Controversy That Surrounded Caster Semenya, the South

What was the controversy that surrounded Caster Semenya, the South African middle-distance runner?​

A) ​He first competed as a man and then had a sex-change operation and competed in the female races
B) ​She competed as a woman and the athletic federation discovered that she had internal male sex organs.
C) ​She first competed as a woman and then changed into a man and competed in the male races.
D) ​Caster would not agree to disclose gender on the race forms.