Write a multi-choice question for the following article, with the given choices and answer: Article: It was not immediately clear how the military officials first spotted the activity at the site. However, the prefix = st1 /United StatesandSouth Koreagenerally share intelligence information obtained through satellite imagery. Meanwhile, more unidentified South Korean government sources said they are trying to confirm whether a new facility that has been built at the site could be part of preparations for a second nuclear test, the JoongAng Ilbo newspaper reported Saturday. Defense officials could not immediately be reached for comment. The news came a day after the South's Foreign Minister and incoming U.N. Secretary-General Ban Ki-moon met with Chinese leaders to discuss sanctions against the North over its Oct. 9 underground nuclear test. Ban met with Chinese President Hu Jintao, State Councilor Tang Jiaxuan and Foreign Minister Li Zhaoxing on Friday. South Korea's Foreign Ministry said they would discuss sanctions, but details of their talks were not immediately released. Ban is visiting the five permanent U.N. Security Council members following his election as secretary-general this month. He pledged to make resolving the North Koreanuclear issue a key priority on his agenda as head of the international body. The United Stateshas been trying to muster greater support for a U.N. Security Council resolution that calls for sanctions in response to the North's nuclear test. Seoul and Beijinghave been reluctant to enforce sanctions over the Oct. 9 test for fear they might aggravate their unpredictable neighbor and destabilize the region. As the North's main aid providers and trade partners, ChinaandSouth Korea's participation are considered crucial for the success of the United Nations resolution, which bans the sale of major arms to the North and calls for inspection of cargo entering and leaving the country. Options: A China and South Korea's dispute overNorth Korea B South Korea's disagreement with the USA C Chinese leaders' meeting with Ban Ki-moon D UN's possible sanction against North Koreabecause of its nuke test Answer: D UN's possible sanction against North Koreabecause of its nuke test Question:
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The passage mainly about _ .