Answer:
D
Explanation:
Feeling excessively sad or low. Confused thinking or problems concentrating and learning. Extreme mood changes, including uncontrollable “highs” or feelings of euphoria. Prolonged or strong feelings of irritability or anger. - nami.org
these would all cause sudden changes in behaviour
A. Flash mobs seem both interesting and safe, unless participants are irresponsible.
Can you shorten the question a little bit shorter please if you can.
Answer:
c.
Explanation:
First, "went dead" does not make sense. it sounds like the whole thing is present and not past tense. so its c. sorry if I'm wrong