Select the letter of the solution that should be used:
Quiet down children, or you will not be able to hear the movie.
a. Add a comma.
b. Remove a comma.
c. Replace comma with another mark of punctuation.
d. No correction is needed.
If you have what can be two separate sentences but want to make them one (creating a compound sentence), use a comma and a coordinating conjunction (for, and, nor, but, or, yet, so) to link them. (More information on compound sentences) The comma should be placed in front of the coordinating conjunction.
Here we seperate two sentences by a comma and the coordinating conjunction is "OR"