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The appropriate option here is option (c).However is a conjunction which is used to introduce a statement that contrasts with or seems to contradict something that has been said previously. Here however can be used in the following way to combine the given sentences (A) and (B) i.e. “The Taiwanese government is claiming that the People’s Republic of China would invade the island state if the U.S. withdrew its support for Taipei, however, it is dubious that Beijing has the amphibious assault capacity or capability to conduct a successful sea-based invasion of Taiwan where a forcible entry is required.”