Magnestism

A wire carrying a current $I$ is shaped as shown. Section $AB$ is a quarter circle of radius $r$ . The magnetic field at $C$ is directed

(A) Along the bisector of the angle $ACB$ , away from $AB$ .
(B) Along the bisector of the angle $ACB$ , towards $AB$ .
(C) Perpendicular to the plane of the paper, directed into the paper.
(D) At an angle $\frac \pi4$ to the plane of the paper.