If sin a+7sin b=4(sin c+2sin d) and cos ...

If `sin a+7sin b=4(sin c+2sin d)` and `cos a+7cos b=4(cos c+2cos d)`,where `a,b,c,d in[0,pi],` then the value of `(cos(a-d))/(cos(b-c))` is
(A) `(7)/(2)`
(B)`(2)/(7)`
(C) `(7)/(4)`
(D) `(4)/(7)`

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