Poets avoid using obvious rhymes, so the poem doesn't sound like a lullaby, as shown in the last answer option.
We can arrive at this answer because:
Rhymes are used to emphasize an element, a term, or anything else important in the poem.
In this case, we can say that poets prefer to make rhymes out of the obvious to emphasize deep elements and promote greater complexity in the poem.
In this case, the poets avoid making the poems look like lullabies, with simple rhymes suitable for children, but want to emphasize deep and important elements of great meaning through the rhyme.
