2a : a sudden, radical, or complete change. b : a fundamental change in political organization especially : the overthrow or renunciation of one government or ruler and the substitution of another by the governed. c : activity or movement designed to effect fundamental changes in the socioeconomic situation.
Listen I am no expertise in drama but though this question can be answered using common sense.
The answer could be dialogue as it has to have action follows with it. A perfect combination.
If need further help refer back to me.
Hope this helps and enlightens your day.
Enjoy...