To balance the equation, we need 1 P₄, 10 KClO₃ to get 10 KCl and balance K and Cl, and 2 P₂O₅ to balance P and O. So a=1, b=10, c=2, d=10. Option A has 3,10,6,10; B has 3,5,3,5; C has 2,3,4,3; D has 1,2,2,2. Option A is correct.

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