The rhetorical device that Obama uses in this passage is an anaphora. The right answer is option 3.
Explanation:
In any kind of literary work be it a writing, speech, poem or sermon, the willful repetition of the first part of the sentence for achieving an artistic effect is known as Anaphora.
The passage from Obama's speech has a common phrase that has been repeated at the beginning of every paragraph or point which is "We are here because, right now..." To give more affect to the points he wanted to address he used this literary device in his speech to hit right on point.
