Correct option is C
The most logical order of the sentences is
(c) B, C, D, A.
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B begins by stating the setting: "A great part of Arabia is desert." This introduces the topic of desert, which sets up the context for the rest of the paragraph.
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C continues with more information about the harsh conditions of the desert: "The sand is so hot that you cannot walk over it with your bare feet in the daytime." This provides a vivid description of the desert's extreme environment.
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D introduces the concept of an oasis, where life can still exist despite the harsh desert: "However, springs of water here and there come up from under the ground that enable vegetation to grow." This is the turning point in the paragraph, showing that life exists in the desert due to oases.
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A concludes with a definition of the place being described: "Such a place is called Oasis." It ties everything together, explaining what an oasis is.
Correct Sentence Order is B, C, D, A.