The Answer your looking for is; It reinforces the idea that rights given to others are not extended to African Americans.
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By using the term "polar opposite", the poet, Mary Nagy, means that she and her husband have different likes, interests and opinions, which are so far from each other that they end up being opposite, as far apart as the North Pole from the South Pole.
In other words, it means that one's interests are diametrically opposed to the interests of the other, since there is nothing more opposite than one pole with respect to the other.
A sentence fragment is a part of a sentence - it cannot exist on its own, but rather has to be included within a larger sentence in order to make sense. Having this in mind, the correct answer is Watching a scary film with my friends at the theater.
This fragment doesn't have a verb at all, which is why it is a fragment rather than a clause, like the other options.