Which of the following is/are true about alliteration, repetition, and parallel structure? select all that apply.
all are often used in speeches for ethos.
all are often used in speeches for pathos.
all are often used in speeches for the way they sound.
all are often used in speeches for emphasis.

I think the correct answer are A, C and D. Alliteration, repetition and parallel structure are often used in speeches for ethos, for the way they sound and for emphasis. These three literary devices are more or less have common parts. They tend to repeat something in order to emphasize something. It may be letter, word, phrases or  the sentence structure.