Final answer:
Among the provided options, 'Ode to a Nightingale' is the poem that is written in free verse, where the poem does not have a set rhyme scheme or meter.
The poem that is free verse among the options provided is 'd. "Ode to a Nightingale".'
Step-by-step explanation:
Free verse poetry is characterized by its lack of a consistent rhythm or rhyme scheme, allowing the poet more creative freedom in expressing their thoughts and emotions. While the excerpts from 'I wandered lonely as a cloud' by William Wordsworth show a clear rhyming pattern with deliberate line breaks and punctuation, 'Ode to a Nightingale' by John Keats doesn't follow a set rhyme scheme or meter, making it an example of free verse poetry.
The understanding of free verse was discussed, notably by Robert Frost, who compared writing in this style to 'playing tennis without a net.' In free verse, the tone of voice and word choice are vital to convey the poem's meaning, as there are no formal rules to rely on.
correct option is 'd. "Ode to a Nightingale".'