question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: As shown in the figure, ⊙O is the circumscribed circle of the quadrilateral ABCD, if ∠O = 110.0, then the degree of ∠C is ()
  Choices:
  (A) 125°
  (B) 120°
  (C) 105°
  (D) 90°