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If a(1),a(2),a(3), . . .. . A(n) are in ...

If `a_(1),a_(2),a_(3), . . .. . A_(n)` are in A.P. and `a_(1)=0`, then the value of `((a_(3))/(a_(2))+(a_(4))/(a_(3))+ . . . . .+(a_(n))/(a_(n-1)))-a_(2)((1)/(a_(2))+(1)/(a_(3))+ . .. . +(1)/(a_(n-2)))` is equal to

A

`n+(1)/(n)`

B

`n+(1)/(n-1)`

C

`(n-1)+(1)/((n-1))`

D

`(n-2)+(1)/((n-2))`

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