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B
By
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C
On
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D
Of
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Solution
The correct option is A Before A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words. Option A)before is correct as it means earlier than. The other options are wrong as by, on, and of indicate usage, a surface, and possession respectively. These uses don't fit in the given question. The correct answer is A)before.