The marks obtained by Vijay and Amith are in the ratio 4:7 and those obtained by Amith and Abhishek in the ratio of 3:2. The marks obtained by Vijay and Abhishek are in the ratio of?  Choose the correct answer:
A) 6 : 8  B) 6 : 1  C) 6 : 5  D) 6 : 7  E) 6 : 3

Rationale: "4 : 7 3 : 2 - - - - - - - 12 : 21 : 14 12 : 14 6 : 7 answer : d"
Answer: D