The right answer is the last answer:)
You didn't give the options for techniques, but I will explain to you what rhythm in a poem is.
Simply put, rhythm can be defined as the beat and velocity of a poem. Rhythm is created by a continuous pattern of 'stressed and unstressed' syllables in a line or verse of your poem. Rhythm can help to strengthen the application of words and ideas in a poem.
D because it does not relate back to boosted brain power
the sentence that is being used in both excerpt are logos. The use of the logos appeal here is to give a reason to support and explain her purpose
Both use an appeal to logos by providing a reason to support her purpose.