Concept:Assonance is the repetition of similar vowel sounds in nearby words within a line.Explanation:In the line “We would be believing we dreamt it”, the vowel sound /i/ is repeated in words like “we”, “be”, and “believing”.This repetition of vowel sounds, rather than consonant sounds, creates assonance.Alliteration involves repeated consonant sounds, while antithesis and apostrophe do not apply to this line.Answer:A. Assonance.