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, points A, B, and C are on ⊙O, if ∠C = 35.0, then ∠AOB = ()
  Choices:
  (A) 17.5°
  (B) 35°
  (C) 60°
  (D) 70°