You can use gestures to emphasize key points. Volume and tone both include verbal so it isn't those, and then pace is how fast you move which usually doesn't affect key points.
A. Historical, due to how long ago the statues were made and their historical value.
B. Macbeth is having a hallucination that he is holding a knife.
B. Eager to eat, Caleb immediately joined the buffet line.
(and maybe C)
