What does the word "panic" in the second paragraph mean

A．prepare for class discussion
B．allow you to study for a test on those lectures
C．leave a deep impression on lecturers
D．Both A and B.

A．listen attentively during the lecture
B．evaluate what the speaker is saying as you listen
C．take it easy if you can't understand the lecturer at first
D．bring a dictionary with you in case you can't understand