Mashaal Masha
$\frac{x^{2}-c}{x-b}$

In the expression above, $b$ and $c$ are positive integers. If the expression is equivalent to $x+b$ and $x\neq b$, which of the following could be the value of $c$?
Difficulty: Hard
A: 

4

B: 

6

C: 

8

D: 

10

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