Because it is in the point of view of someone telling exactly what happened at what time and a reporter would not know and it does not say the author is the person talking.
2) C. Angry
Because he's angry about what is happening so when the policeman shook his club he really probably just was mad at what happened which is where the title "we shall not be moved" came from because the author was implying that they won't be moved even if the policeman was threatening them
3) B. Stand up to walk out
It says one person stood up and then everyone stood and everyone walked out together.