Most of China's population is concentrated: a)in the eastern region.
b)in the northern deserts.
c)on its many islands.
d)inland, away from the coastline.

Correct answer is a) in the eastern region.

Explanation:

A is the correct answer because all larger cities are located in the eastern part of the country, including Beijing, Shanghai and many others, that are near or on the Pacific ocean.

B is not correct as deserts in the country are mostly not inhabited.

C is not correct as China doesn't have such a large number of islands.

D is not correct as there aren't so many inhabited areas in the continental part of the country.