Answer and Explanation: After many loses against North Korean, in 1950 the Republic of Korea (ROK), the United States and the United Kingdom forces set up a defense line on the Pusan Perimeter near the city of Pusan. After six weeks of conflict and continuous battles, the North Korean army had to retreat because of a shortage of its supplies
<span>"C. Private firms cut canals at key points and connected
rivers" and "D. Thanks to a web of waterways, boats could reach towns they
had never been able to reach before" are both correct, although roads were beginning to be used more as well. </span>
Its to like put them at harm or in a negative sutiation/position.
