A poem's rhyme scheme is usually marked with letters - such as ABAB.
Answer: Option B
Step-by-step explanation:
Rhyme Schemes are the patterns of sounds that are repeated at the end of every line in the poem. For example:
‘The sun was glowing,
The stars were sparkling,
The waves were flowing,
And the forests were darkling.’
Here you can see the first and the third line makes a rhyme scheme ‘glowing-flowing’, and the second and fourth makes another rhyme scheme ‘sparkling-darkling.’
Such rhyme scheme in poems are marked with letters ABCD. So for the given example the rhyme scheme is ABAB.