We can actually infer that the details from "The Oasis: Africa" that best supports the central idea that nature can be severe and unkind is: "Clutch tight your water-skin on the desert, for there is no charity on the Sahara, and he that has no water shall not drink!"
<h3>What is central idea?</h3>
Central idea of a passage or story actually refers to the major and important idea that is seen in that passage or story which the writer seeks to communicate to the readers.
Central idea is also known as main idea. It usually tells about the important subject of a text, passage or story.
We can see that the last option actually shows the central idea of how nature can be unkind and severe. It shows that the Sahara (a natural desert area) has no charity for people.
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