What Is the Definition of a Social Movement

What is the definition of a social movement?

A) a well-organized collection of ordinary people working to get their voices heard by the public at large
B) a loosely organized collection of ordinary people working to get their voices heard by the public at large
C) a well-organized collection of elites working to get their voices heard by the public at large
D) a loosely organized collection of elites working to get their voices heard by a small portion of the public
E) a loosely organized collection of media and leaders working to get their voices heard by the public at large