Which of the following is NOT correct according to the passage?
选项：

A:The developing countries believe that sending students to the industrialized countries is a good way to meet their own needs for modernization.
B:The South American countries have been sending students to developed countries since the 1920s.
C:Many people trained abroad remain in the developed countries instead of coming back to serve their home countries.
D:The International Organization for Migration successfully helped more than 1, 600 professionals to return to their own countries in a single year.