Final answer:
The rhyme scheme of the provided poem is 'AAA B', as the first three lines rhyme with each other and the fourth line has a different end rhyme.
Step-by-step explanation:
The rhyme scheme of the poem is assessed by looking at the end rhymes of each line. In this case:
- Once upon a time, (A)
- while eating a lime, (A)
- I heard a distant chime (A)
- from a faraway tower. (B)
The first, second, and third lines all rhyme with each other (time, lime, chime), so they are given the same letter, 'A'. The fourth line (tower) does not rhyme with the previous lines, so it is given a different letter, 'B'. Hence, the rhyme scheme is 'AAA B'.