The woman has given up the idea of writing about the formation of Death Valley becauseA．th

The woman has given up the idea of writing about the formation of Death Valley because

A．the topic covers too much.

B．she has not done much research on that.

C．it is rather a hard topic.

D．she can not find enough references.

请帮忙给出正确答案和分析，谢谢！