Sentence Correction

Que :
The reason that China has become largest manufacturer of consumer goods in the world is that it has the ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with.

A. The reason that China has become largest manufacturer of consumer goods in the world is that it has the ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with
B. The reason that China has become the largest manufacturer of consumer goods in the world is because of its ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with
C. China has become the largest manufacturer of consumer goods in the world because it has the ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with
D. Because of China's ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with, it has become the largest manufacturer of consumer goods
E. Because of China's ability to provide huge work forces at low costs and, therefore, offer prices that cannot be competed with, it has become largest manufacturer of consumer goods in the world

OA: [spoiler]"C"[/spoiler]
Source : MasterGMAT
Request: Post Explanation + Time taken