If a:b=\frac{2}{9}:\frac{1}{3}, b:c=\frac{2}{7}:\frac{5}{14} and d:c=\frac{7}{10}:\frac{3}{15} , then find a:b:c:d
[A] 56:84:30:30
[B] 16:24:30:35
[C] 56:24:30:30
[D] 56:24:30:35

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