Answer
$\bf{Graph-B}$
Work Step by Step
The conversion of polar co-ordinates $(r, \phi)$ to rectangular coordinates $(x,y)$ is given by:
$x=r \ \cos(\theta)$, $y=r \ \sin(\theta) $
where, $r=\sqrt{x^2+y^2}$
We are given the equation: $ r \cos(\theta)=2 \implies x=2$
This means that the given equation is equivalent to $x=2$, which is a vertical line through the point $x=2$.
Therefor, our required answer is $\bf{Graph-B}$.
