Which of the following is a major concern for north korea today

The correct answer for the question that is being presented above is this one: "A. undertaking the difficult transition to democracy." The major concern for North Korea today is that A. undertaking the difficult transition to democracy

Here are the following choices:
A. undertaking the difficult transition to democracy
B. finding a leader to replace Kim Jong-Il
C. producing enough food for its people
D. preventing China from invading from the north