The most accurate response regarding the effect of the repetition of the word "and" in Emily Dickinson's poem "Hope is the thing with feathers" is:
The repetition of and creates a sense of piling up and adding on. This reinforces the idea that the bird sings and brings hope to everyone no matter what.
This interpretation reflects how the repeated use of "and" contributes to the continuous and overflowing nature of hope as represented by the bird in the poem, emphasizing that hope persists through various challenges and circumstances.