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If `f(x)` is continuous for all real values of `x ,` then `sum_(r=1)^nint_0^1f(r-1+x)dx `is equal to (a)`int_0^nf(x)dx` (b) `int_0^1f(x)dx` (c)`int_0^1f(x)dx` (d) `(n-1)int_0^1f(x)dx`

A

`int_(0)^(n)f(x)dx`

B

`int_(0)^(1) f(x) dx`

C

`n int_(0)^(1)f(x) dx`

D

`(n-1)int_(0)^(1) f(x) dx`

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