It is for an online article. Maybe from a popular magazine's website.
Answer:
B. it is often transitory—that is, it is brief and passing.
Explanation:
There are lots of different kinds of collective behavior, so trying to identify a specific set of standards or reasons to suit all is very difficult. Also, episodes of collective behavior —such as riots, social panic, and more— are unpredictable and last for a short time, which represents a difficulty for sociologists who want to analyze them as they take place. People involved in these events are often strangers to each other, making it even harder to determine who took part in them.
Rocket scientists work in NASA, or space agencies. They are also there to help develop new
rocket powered by weapons for military use.
This question about Dr. Awkward is a riddle, and the one
problem he never has spelling his name backwards. Even he spells his name
backwards, it still is the same.
