Suppose Bianca buys a used a textbook from Sebastian for $55. If Bianca's surplus from this transaction was $10, we can infer that:
A. Bianca's reservation price was $60, and Sebastian's reservation price was $50.
B. Bianca's reservation price was $45.
C. Bianca's reservation price was $65.
D. Sebastian's reservation price was $45.
Answer: C
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