Answer:
Assonance.
Explanation:
A simile requires "like" or "as" and metaphors require something to be called something it is not (e.g "Time is money"), finally, alliteration is the usage of repeating letters (e.g Bart Baker beat the baseball) so through the process of elimination, it is most likely assonance.
The preposition that is used in the given sentence above is the word "at", so the prepositional phrase is "at least once". Therefore, the words that are part of the prepositional phrase in this sentence are the words least and once. Hope this answers your question. Have a great day!
