Answer
${\bf 0}\;\rm T\cdot m $
Work Step by Step
We can see that the magnetic field is perpendicular to the direction of the path.
So, the integral of $\vec B$ between the two points $i$ and $f$ is given by
$$\int_i^f \vec Bd\vec r=B r\cos90^\circ =\color{red}{\bf 0}\;\rm T\cdot m $$
