Mashaal Masha
$x$ $-11$ $-10$ $-9$ $-8$
$f(x)$ $21$ $18$ $15$ $12$
 
The table above shows some values of $x$ and their corresponding values $f(x)$ for the linear function $f$. What is the $x$-intercept of the graph of $y=f(x)$ in the $xy$-plane?
Difficulty: Hard
A: 

$(-3,0)$

B: 

$(-4,0)$

C: 

$(-9,0)$

D: 

$(-12,0)$

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