Why are American-educated nationals referred to as sea turtles?
A、Because it sounds the same to the pronunciation of the Chinese version referring to those students who came back hometown from other countries.
B、Because those students are like sea turtles who come back and settle down in China after their graduation.
C、Because they are like sea turtles that will travel afar from hometown every year.
D、Because they will stay in America after their graduation and start their life there.