The rhetorical strategy that Thomas Paine most clearly is using in the given line above is parallelism. The correct answer is option C. Parallelism is common in poetry and literature. It is the use of grammatical components in a sentence with the same sound, meter, meaning and construction. In the given line above, the construction of both sentences is the same, as well as the use of the words "will be" plus the -ing form of the verb.
It's used when a speaker wants to signal that this particular question is the one that needs an answer to resolve a make-or-break situation. It's often used as part of a rhetorical question. i.e. there's no real answer to the question posed.