2 moles of `FeSO_(4)` are oxidised by x moles of `KMnO_(4)` in acid medium into ferric sulphate. 3 moles of ferric oxalate are oxidised by y moles of `K_(2)Cr_(2)O_(7)` in acid medium. The value of `(x//y)` is :
A. `6//5`
B. `2//15`
C. `18//5`
D. `3//5`
