The korean peninsula is divided into two separate countries by the
a. 49th latitude
b. 38th parallel
c. north korean wall
d. mason dixon line

Option (B)

Explanation:

The 38th parallel is a name that was popularly given to latitude of 38° N located in the eastern part of Asia. This line of latitude separates North Korea from South Korea. This line was made by the U.S. military planners, in the year 1945 at the Potsdam Conference, before the end of World War II. This was a borderline set by the armies where the Union of Soviet Socialist Republics (U.S.S.R) and the Americans were present on the northern side and south side respectively in order to accept the Japanese forces who surrendered after the end of the war.

Thus, the Korean Peninsula is broadly separated into two separate countries namely North Korea and South Korea.

Hence, the correct answer is option (B).

81 is a composite number.