其实 不发达地区大都拥有丰富的资源 发展潜力很大。()

其实，不发达地区大都拥有丰富的资源，发展潜力很大。()

A、In fact.most of the less developed areas are rich in natural resources.vet have great potentials for development.

B、In fact.most of the less developed areas are rich in natural resources，and have great potentials for development.

C、In fact.most of the less developed areas are rich in natural resources.but their development potential is very great.

D、In fact.most of the less developed areas are rich in natural resources，as their development potential is very great.

请帮忙给出正确答案和分析，谢谢！