For the Following Statements and Arguments, Choose Which One of the Following

For the following statements and arguments, choose which one of the following statements best describe the evidence:
-I've known six different Chinese kids in six different classes. Each one of them was at the top of the class. Chinese kids do really well in school.
Conclusion: Chinese kids do really well in school.

A) The sample is not sufficient in size or is not given.
B) The sample is not random.
C) The sample is not representative (or is lacking in breadth) .
D) The sample is sufficient, random, and representative.