Consider a circle with centre $O$. Two chords $A B$ and $C D$ extended intersect at a point $P$ outside the circle. If $\angle A O C = 43 ^ { \circ }$ and $\angle B P D = 18 ^ { \circ }$, then the value of $\angle B O D$ is\\
(a) $36 ^ { \circ }$.\\
(B) $29 ^ { \circ }$.\\
(C) $7 ^ { \circ }$.\\
(D) $25 ^ { \circ }$.