The best definition of alliteration is "the repetition of consonant sounds at the beginning of back-to-back words," as stated in option A and explained below.
We can define alliteration as the repetitive use of the same consonant sound in the beginning of words that appear next to one another. Perhaps one of the most famous examples of alliteration is the tongue twister "Peter Piper picked a peck of pickled peppers." Here, the "p" sound is repeated.
With the information above in mind, we can choose option A as the best definition of alliteration, as it includes all the elements mentioned in the definition above.
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