Question

Which technique does not add to the memorability of a speech?

Answer 1

There are many techniques that can contribute to the memorability of a speech, for example stressing the main points and explaining them  well, linking the ideas in a logical way and providing a strong conclusion. 

One technique that does not support memorability is shouting loudly key words: they might remember you but not the content of the speech.

Answer 2

It might be using a loud voice, shouting key words