B: assonance
This is called Euphony, the use of pleasant, soft sounding vowels, to create a pleasant vibe, as a 'host of golden daffodils' would.
The phrase "A host of golden daffodils" has assonance from the repeated "o" sound. This is the repetition of a vowel sound within words for poetic effect. It is a form of internal rhyme that does not require similar consonants around the vowel sounds, so the repetition can be used in a subtle way.
Assonance
This is probably Echo.
Repeated echoes are called reverberations. They occur when sound waves reflect off surfaces multiple times, creating a persistence of sound in a space.
A sound that is repeated is referred to as an echo. This generally happens in a cavern or valley, where the sound bounces from a far surface and comes back. When sounds are repeated in writing, it's called alliteration. For instance, "Sally sold seashells by the seashore".
It is called "sibilance."
The repeated vowel sound within words in a phrase is called "assonance." It is a literary device that involves the repetition of similar vowel sounds to create a musical or rhythmic effect in the text.
Assonance (the repeated vowel sound) and consonance (the repeated consonant sound).
Assonance is a vowel sound that is repeated internally in words in a phrase.
Reverberations.
its reverberation