Final answer:
Kennedy uses parallelism as a rhetorical strategy, and the option that is not one of the Four Freedoms FDR describes is freedom of commerce.
Step-by-step explanation:
The rhetorical strategy most clearly used by Kennedy in the excerpt is parallelism. Kennedy uses parallelism for impact and to organize his support for the idea that the United States works collaboratively for "the success of liberty." Parallelism is a form of repetition and can be used as an organizational strategy and to emphasize ideas.
The option that is not one of the Four Freedoms FDR describes in his Four Freedoms speech is c) freedom of commerce. The Four Freedoms FDR describes are freedom of speech, freedom of worship, freedom from want, and freedom from fear.