The third alternative is correct (C).
Iran has challenged a UN Security Council resolution calling for the suspension of uranium enrichment in the country. The fear of the international community is the country getting the technology to produce a nuclear bomb.
Iran claims that it is only doing what is provided for in the Nuclear Non-Proliferation Treaty (NPT) and intends only to enrich uranium to the level needed for a fuel power plant.
However, the international community is skeptical of Iran's real intentions. In this context, the US has proposed increasing economic embargoes for that country, including oil.