Does the division of Area C of the Great Metallurgical River bend belong to No.6 Middle School or Mengzhong Middle School?

First, Qinghai Lake-the geographical area of China. Therefore, A is incorrect;

B Dujiangyan, the administrative district of China. Therefore, B is correct;

C, the Pearl River Delta-the economic development region of China. Therefore, c is incorrect;

D, Chengdu Plain-the topographic area of China. So d is incorrect.

Therefore, choose: B.