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Assume their age ratio is $x$

then age of 3 person is $4x$,$7x$ ,$9x$

According to the question,$8$ year ago the sum of their age was $56$

$\Rightarrow (4x-8)+(7x-8)+(9x-8)=56$

$\Rightarrow 20x-24=56$

$\Rightarrow 20x=80$

$\Rightarrow x = 4$

Now their present age is $16,28,36$, Option B.
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