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B against C with D on E upon
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Solution
Verified by Toppr
The correct option is B. On 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 B 'on' is correct as it is used to express an involvement in a particular activity. The other options are wrong as at, upon, against and with indicate a specific location, a surface above something, opposition and inclusion respectively. These uses don't fit in the given question. The correct answer is B 'on'.
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