描述某地的位置与特色 — 英语选择题

一座城市位于中国东南部，而且是一座大城市。下面哪句话描述正确？ A. Shanghai is in the southeast part of China. It is a big city. B. Shanghai is in the northwest part of China. It is a big city. C. Shanghai is in the southeast part of China. It is a small city. D. Shanghai is in the northeast part of China. It is a small city.