Given below are four jumbled sentences. Select the option that gives their correct order. 

A. For example, the sound of footsteps followed by the slam of a door are like phrases which convey some information. 

B. In films, sound effects play the part of words.

C. We then know who is performing an action and why, and a clear picture is formed in our mind's eye. 

D. Once the sounds are prefaced or followed by a dialogue, the sentence is complete.