To avoid speaking in monotone, a strategy to use can include
D. All of the Above
This is the correct answer because they're all ways to change your voice and avoid making your speech too monotone
Which nonverbal consideration creates immediate impressions among your audience?
B. Physical appearance
This is the answer because most likely, before anything, this is the first thing that your audience will have contact with.
What type of visual aid is showing the actual thing being discussed?
C. Object
If you have the object of your discussion in hands, it's both the actual thing itself and a visual aid.
All of the following are reasons that visual aids are useful in speech delivery EXCEPT
B. their presence allows the speaker to take a rest from talking.
This is not the purpose of the visual aid at all. You should not be worrying about how not to talk during your own speech.