When practicing to give an effective speech, it is important to
a. consider body language.
b. think about the audience.
c. consider use of visuals.
d. wear appropriate attire.

I believe it's A. It's not only because you think the audience is going to be bored, it's  what say it makes them interested in it. When considering visuals it's fine to do it, but using visuals isn't the major thing to worry about. Wearing appropriate attire doesn't matter only if your giving a speech in a formal event. (Nice question by the way)

•as parts of ceremonies and often to ask for peace and blessings from evil. • late at night to entertain themselves or foreign visitors at the camp. • on long journeys through the arizona desert, to keep their energy and minds boosted. • during the long winter nights, when they were cold and the land was not suitable for farming.