100
Amy was smiling and laughing. Then, her teacher said, "I hope each of you enjoyed writing your report on James Buchanan. I know he is my favorite U.S. president." Amy's smile turned into a frown. She wrote about the wrong president. It was too late to hide her blunder by writing a new report. She would have to turn in her report about Chester A. Arthur.
Based on the context in which it appears, what is the meaning of blunder?
A. sadness
B. shame
C. homework
D. mistake