2. which of the following topics would be too broad for a speech lasting 5 to 10 minutes?

I am not too sure there is a clear answer to this question: in principle, you could hold a speech of 10 minutes on any topic, but the depth of the treatment of the topic would have to be adjusted.

I would choose answer C. the history of modern interior design: describing a history of anything requires a lot of details, and those need time.

Specifically, I find that options A and B are very easily condensed for 10 minutes: they are in any case not good options.

D. depends on whether this is just a general introduction or a very detailed, practically oriented, tutorial.

U.S. history

Explanation:

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

your answer is c) experiments with water vapor showed that elements combine in specific proportions.