The function of the prepositions used in the sentence is C. The prepositions show location.
What is a Preposition?
This refers to the part of speech that is used to show spatial relationships between two or more items.
Hence, we can see that from the given sentence, the prepositions "above and below" help to show the location of both the reef and the water and option C is correct.
Read more about prepositions here:
https://brainly.com/question/17476214
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