Which statement best describes US involvement in the Korean Peninsula today?
A. The United States has withdrawn all of its troops from the region and left North and South Korea to work out their issues alone.
B. The United States continues the war on the side of South Korea, in hopes of gaining ground from the communists.
C. The United States has withdrawn all of its troops except those along the Yalu River between China and North Korea.
D. The United States has troops in place to help patrol the demilitarized zone between North Korea and South Korea.