1.
which of the following topics is too broad for a 10-minute speech?
a.
classes offered in interior design
b.
interior design tips for the college dorm
c.
the history of modern interior design
d.
preparing for a career in interior design

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. 

What the words