Question

which is not a guideline speakers should follow when using props?
choose props that reinforce the speechs content in some way.
decide before the speech on a logical way to lay out the props.
look only at the prop when you use it so that you dont drop it.
mark when to use a prop on the speaking outline.
speak toward the audience rather than toward the props.

Explanation:

When using props in a speech, speakers should engage with the audience. Looking only at the prop would disconnect from the audience. Choosing relevant props, planning their layout, marking their use in the outline, and speaking to the audience are all valid guidelines.

Answer:

"Look only at the prop when you use it so that you don't drop it." is not a guideline speakers should follow.