Let $ABC$ be a scalene triangle with incentre $I$ and circumcentre $O$. Suppose $B, C, I, O$ are concyclic points. Then $\angle B + \angle C$ is (in $^{\circ}$)

  • A
    $60$
  • B
    $105$
  • C
    $120$
  • D
    $135$

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