The answer is of course B - water.
Japan is consisted out of four big islands (Honshu, Hokkaido, Shikoku, and Kyushu). While each of them also has their own small characteristics, separate from each other, Japan has in general been isolated due to its specific geographical environment. Not being connected to any landmass such as neighbouring China, the only contact they could have had was by boat. And travelling by boat has always been more difficult compared to packing your stuff and going somewhere.
The death of the hostages.
Answer: The Emancipation Proclamation and Thirteenth Amendment brought about by the Civil War were important milestones in the long process of ending legal slavery in the United States. This essay describes the development of those documents through various drafts by Lincoln and others and shows both the evolution of Abraham Lincoln’s thinking and his efforts to operate within the constitutional boundaries of the presidency.
Explanation: Events early in the war quickly forced Northern authorities to address the issue of emancipation. In May 1861, just a month into the war, three slaves (Frank Baker, Shepard Mallory, and James Townsend) owned by Confederate Colonel Charles K. Mallory escaped from Hampton, Virginia, where they had been put to work on behalf of the Confederacy, and sought protection within Union-held Fortress Monroe before their owner sent them further south. When Col. Mallory demanded their return under the Fugitive Slave Law, Union General Benjamin F. Butler instead appropriated the fugitives and their valuable labor as "contraband of war." The Lincoln administration approved Butler's action, and soon other fugitive slaves (often referred to as contrabands) sought freedom behind Union lines
You didn't list options, but I'll suggest an item which famously occurred during Warren G. Harding's presidency:
<h2>The Teapot Dome Scandal</h2>
This was a scandal in which one of President Harding's cabinet members illegally leased oil reserves. President Harding was not directly implicated in the scandal, but was affected by it. After President Harding transferred supervision of the naval oil-reserve lands from the navy to the Department of the Interior in 1921, Secretary of the Interior Albert Bacon Fall secretly gave Harry Sinclair of the Mammoth Oil Company exclusive rights to the Teapot Dome reserves in Wyoming. He granted a similar deal to another oil company executive. The secret leases came under Congressional investigation. Congress directed President Harding to cancel the leases, and the Supreme Court ruled that Harding's transfer of authority to Interior Secretary Fall had been illegal. The whole affair took a toll on President Harding's health. He died in office in 1923.
