The correct answer is c.: it served as the be boundary between North Korea and South Korea. The current line is in a similar place, but it's not a straight line, unlike the line running along the 39th parallel.
The president cannot be chief justice - this would be a breach of the separation of powers. Chief Justice is a member of the judicial branch of the government; and the president is the head of the executive branch of the government, so they should not be the same person - the answer is d)
Water, and I guess just aid in general if that counts, but mostly water
That would be the<span> esophagus.</span>
