Which element must and effective wartime speech have
a) rehearsed physical gestures
b )well placed metaphors
c) focus on the positive
d) strategic use of audience appeal

The elements that a wartime effective speech must have are (C) focus on the positive and (D) strategic use of audience appeal.  

The warrior discourse uses words, phrases, texts, images that repeat, stand out and generate beliefs that legitimize violent actions. And for this, it is necessary to converse with the audience, to achieve empathy with them.

On the other hand, by focusing on the positive, only refers to the "benefits", but their real problems, miseries and pain are ignored.

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.