Which of the following sentences has correct subject-verb argeement?

a. Visitors to the north part of the Korean peninsula notice immediately upon crossing the border that they have entered another , poorer country .

b. People in the south has a great diversity of employment opportunities because of the many businesses and industries that have sprung up there in the last fifty years.

C. a matter of fact, the standard of living for the typical South Korean make them one of the most prosperous of all people in the Pacific Rim.

Which one is clearly correct? Read them out loud.

Visitors … notice …
People … has …
… standard … make …