Collective behavior is difficult to study because select one:
a. it involves only one particular kind of behavior.
b. it is often transitory—that is, it is brief and passing.
c. it is always violent.
d. people object to being watched.

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.

the united states constitution is the supreme law of the united states. the constitution, originally comprising seven articles, delineates the national frame of government. its first three articles embody the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislative, consisting of the bicameral congress; the executive, consisting of the president; and the judicial, consisting of the supreme court and other federal courts. articles four, five and six embody concepts of federalism, describing the rights and responsibilities of state governments, the states in relationship to the federal government, and the shared process of constitutional amendment. article seven establishes the procedure subsequently used by the thirteen states to ratify it. it is regarded as the oldest written and codified national constitution in force.

the answer would be in this answer. someone already asked the question.