An iamb is a word with the pattern unstressed/stressed. "Denote" is your best bet here. Tennessee is most likely anapestic, as it is three syllables. Iambic is always two. When looking at anything iambic, the second syllable is going to be drawn out, so it would sound like "de-KNOWt."
We have stepped up our war production on a scale that is testing our industrial power, our engineering genius and our economic structure to the utmost.
Answer:
The option Invocation is the answer
Lines with a recurring metrical unit, in other words a verse