The boundary line between North and South Korea was set at:

a. the 17th parallel.
b. the Yalu River.
c. the 38th parallel.
d. the city of Seoul.

http://worldatlas.com/webimage/countrys/asia/kr.htm

How do I found out if some one has being kind enough to answer my world history questions.

Underneath your question you'll see another post. Click the link to your original post and you'll see all of the answers.

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The boundary line between North and South Korea was set at the c. the 38th parallel. To know this answer, you can refer to the history of the Korean War. The Korean War took place from 1950 to 1953 and resulted in the division of Korea into North Korea and South Korea along the 38th parallel. The 38th parallel acted as a demilitarized zone between the two countries. So, the correct answer is c. the 38th parallel.