Why did shakespeare's use iambic pentameter for dialogue of noble characters while commoners often spoke in blank in verse or prose

Read the excerpt from "a defence of poetry.” poetry thus makes immortal all that is best and most beautiful in the world; it arrests the vanishing apparitions which haunt the interlunations of life, and veiling them, or in language or in form, sends them forth among mankind, bearing sweet news of kindred joy to those with whom their sisters abide—abide, because there is no portal of expression from the caverns of the spirit which they inhabit into the universe of things. poetry redeems from decay the visitations of the divinity in man. which details from the excerpt provide more information about shelley’s idea that poetry "makes immortal all that is best and most beautiful in the world”? check all that apply. arrests the vanishing apparitions which haunt the interlunations of life sends them forth among mankind, bearing sweet news to those with whom their sisters abide no portal of expression from the caverns of the spirit redeems from decay the visitations of the divinity in man