The answer is c. public policy
Hope this helps :D
C. Stock is indeed traded on respected markets (ex; NY stock exchange) but is regulated by the governing body of that countries stock market (in my case the U.S. Gov regulates the Stock exchange in the U.S.).<span />
I believe that the Korean War started when the North Korean Communist army crossed the 38th Parallel and invaded non-Communist South Korea.
I think the letter B is the answer
