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The range of the function f(x)=(x^2+x+2)...

The range of the function `f(x)=(x^2+x+2)/(x^2+x+1),x in R ,` is
(a) `(1,oo)` (b) `(1,(11)/7)` (c) `(1,7/3)` (d) `(1,7/5)`

A

`(1,infty)`

B

`(1,11/7)`

C

`(1,7/3)`

D

`(1,7.5)`

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