Which is a serious problem for South Sudan?

A) controlling the oil field

B) using child soldiers from Sudan

C) transporting oil through Sudan

D) grazing rights on agricultural land

C transporting oil through Sudan. I guess it right

The correct answer should be A) controlling the oil field

Although Sudan is rich in oil, the industry is underdeveloped which makes it easy for various groups to compete over the oil fields. This causes a lot of issues and many of them are even based on ethnicity.