If A : B = 3 : 7, B : C = 9 : 7 and C : D = 7 : 8, then A : B : C : D = ?
A27 : 49 : 63 : 56
B27 : 56 : 63 : 49
C27 : 49 : 56 : 63
D27 : 63 : 49 : 56
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