D would be the correct answer
b. Northwest
The Northwest Passage was a presumed pathway through which sailors could easily sail through the Americas to reach the Pacific Ocean and India. However, it did not exist and sailors were forced to travel around the southern tip of South America until the construction of the Panama Canal in the early 1900s.
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The assassination of Franz Ferdinand is what started WW1, which was done by Serbian rebels, but the county was Austria-Hungary. The two nations that escalated the conflict was Russia, who supported Serbia, and Germany, who supported Austria.