—Do you mind if I open the window?

—      . I feel a bit cold.

A．Go ahead

B．Of course not, it's not allowed here.

C．I'd rather you didn't

D．Why not?

清代北京外城分东城，南城，中城，北城，西城五区，其中商贾和土著汉人居住在（）。

A.西城

B.东城

C.南城

D.北城