If A:B=1/2​:3/8​, B:C=1/3​:5/9​, C:D=5/6​:3/4​, then the ratio A:B:C:D is: ?

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Ratio And Proportion
If A:B=1/2​:3/8​, B:C=1/3​:5/9​, C:D=5/6​:3/4​, then the ratio A:B:C:D is:
a) 4 : 6 : 8 : 10 b) 6 : 4 : 8 : 10 c) 8 : 6 : 10 : 9 d) 6 : 8 : 9 : 10
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