Which best explains why africa and east asia are ideal locations for companies to find offshore labor?

i. labor is generally inexpensive.
ii. there is a large poll of educated laborers.
iii. industrial practices are well developed.
iv. laborers have access to the area’s rich resources.

i only
iii only
ii and iii
ii and iv
iii and iv

II and IV

Why the II can't explain that:

There aren't educated laborers, cause the multinational companies uses the first labourers they found, so the average of them is not always qualified, and the most of them is poor and have not get an instruction.

Why the III can't explain that: In some parts of Africa and Asia, where labourers mine,work or do other things for multinational companies, the industries are not developed at all, and in case the companies their self had to develop ones in those territories