The correct answer is (b).
The UN Commission on Human Rights was replaced by the UN Human Rights Council in 2006. The Council is a more powerful body with a wider mandate, and it is responsible for promoting and protecting human rights around the world.
The Human Rights Committee is a body of independent experts that monitors the implementation of the International Covenant on Civil and Political Rights. It is not a replacement for the UN Commission on Human Rights, but it does play a role in ensuring that countries comply with their human rights obligations.
The International Human Rights Organization is a non-governmental organization that works to promote and protect human rights around the world. It is not a UN body, but it does cooperate with the UN on human rights issues.