Given below are some questions with four highlighted words in each to be swapped if required in order to make the sentence contextually correct. If no swapping is required then choose option E as your answer. One of those was a TB-001 drone, which (a) crossing around Taiwan, first (b) flew the Bashi Channel that (c) separates Taiwan from the Philippines, then up the east of Taiwan before crossing back toward the Chinese coast, according to a map (d) provided by the ministry.