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The reactant is what you begin with.
The product is what you end up with (so the answer is B)
(1,0)n +(235,92)U --->(91,36)Kr + (142,56) Ba + 3(1,0)n
Hope this helps! chemical test is a qualitative or quantitative procedure designed to identify, quantify, or characterise a chemical compound or chemical group. It is used to see if the driver had presence of alcohol or drugs in their system