I would say that the element of plot structure that refers to the building up of conflicts and action is D. desis.
Climax happens at the peak of these conflicts. Lusis is the resolution of conflicts. Exposition is the introduction.
Desis means complication.
Research can be used to prove something true is tell factual info about something! Research is conducted in a wide variety of topics from illnesses to animals etc.
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I think taking away all guns is not good but gun control and making sure that gun owners are responsible and safe is a good thing. Slippery Slope
She successfully diffuses the tension by engaging Mr. Cunningham in conversation and is responsible that no violence occurs outside the jail that night.