Using this map and your knowledge of geography, which country listed has the lowest population density?
a) india
b) japan
c) china
d) south korea

All of the countries above have a relatively high population density (but less than Macao, Hongkong and Singapore).

From them, South Korea has the highest population density, after that it's India and  Japan.

The correct answer is China- mostly due to the size of its land!

Answer the use of flood plains and irrigation;