(1) is incorrect. Article 10 of the Trademark Law stipulates that place names of administrative divisions above the county level shall not be used as trademarks. However, place names with other meanings are excluded. "Peace" has other meanings and can be used as a trademark.

(2) Yes. Article 24 of the Patent Law stipulates that if the invention, utility model and design for which a patent is applied for is first exhibited at an international exhibition sponsored or recognized by the Chinese government within six months before the application date, the novelty will not be lost. A participated in an exhibition in June 2008 and filed a patent application in September 2008, within six months, so the novelty was not lost.

(3) Correct.

(4) It is illegal for C to guarantee the quality of products using his trademark. A trademark licensor must monitor the quality of the products on which the licensee uses its registered trademark.