100
Which sentence is incorrect?
A. She had a nonchalant attitude about the upcoming exam, hence she went to the library to study everyday and attended all of the review sessions.
B. The boy tried to appear nonchalant when he was called to the principal's office, however he was overwhelmed with fear.
C. Although James is always stressed out about something, he comes across as nonchalant and without worries.
What is A.