The correct answer is - fundamental human rights were violated.
The Chinese one-child policy lasted for few decades, and its purpose was to control the quick rise of the population in the country. It was voted and accepted that the families in China should have no more than one child, and if they did, they were facing a big fines.
This move by the Chinese government is seen as a violation of the human rights, and this is because the government got directly involved into the structure of the family, and it tried to control it the way it found it suitable according to their own interest.
