The sentence contains correct word usage a beautiful rainbow emerged from behind the storm clouds. Thus the correct answer is D.
What is a sentence?
A sentence is referring a grammatical structure consisting of a group of words having a subject and predicate in it defining the clear meaning to the reader.
|n this sentence D rainbow emerges where the meaning of verb emerging is come as "appear" which is best suited in the context of the rainbow.
Therefore, option D is appropriate.
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