The correct answer is: D. Nairobi
The Tenth Ministerial Conference of the World Trade Organization (WTO) was held in Nairobi, Kenya, from 15 to 18 December 2015. The conference was attended by over 150 WTO members, as well as representatives from other international organizations. The main topics of discussion at the conference were trade facilitation, agriculture, and development.
Geneva is the headquarters of the WTO, and it has hosted several ministerial conferences in the past. However, the Tenth Ministerial Conference was the first time that the WTO had held a conference in Africa. This was seen as a significant step forward for the WTO, as it demonstrated its commitment to promoting trade and development in developing countries.
Manila is the capital of the Philippines, and it has hosted several international conferences in the past. However, it has never hosted a ministerial conference of the WTO. Helsinki is the capital of Finland, and it has hosted two ministerial conferences of the WTO, in 1994 and 1996.
In conclusion, the Tenth Ministerial Conference of the World Trade Organization was held in Nairobi, Kenya, from 15 to 18 December 2015. This was the first time that the WTO had held a conference in Africa. The main topics of discussion at the conference were trade facilitation, agriculture, and development.