question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: Karen bought 4 pounds of silk scraps and 4 pounds of canvas scraps. How much did she spend? (Unit: $)
  Choices:
  (A) 64
  (B) 59
  (C) 69
  (D) 70