B. "With raven's feather from unwholesome fen"
In order to qualify as being written in iambic pentameter, the line needs to first have 10 syllables.
With | ra | ven's | fea | ther | from | un | whole | some | fen
1 2 3 4 5 6 7 8 9 10
Then, you need to check meter for stressed and unstressed syllables. To make this easier, look at two syllable words first. For instance, 'raven's' and 'feather' both put the emphasis on the first syllable. 'unwholesome' puts the emphasis on 'whole'. You can mark the line from there with alternating stress (/) and unstress (u), seeing if the rhythm fits.
u / u / u / u / u /
With | ra | ven's | fea | ther | from | un | whole | some | fen
Well, after a quick sweep of the poem, I would have to say awe, wonder, informal, powerful, clear, and positive.
I believe it is because the government selects you if you are good enough for it.