The correct answer to this question is False. Alliteration is when consonant sounds are repeated throughout a sentence. The first consonant in the sentence would be repeated. In this example, the letter S is there twice, but there are a number of other consonants present, which cancels it from being alliteration.
If the sentence said, "The shallow sea tides souls swoon, Shelly," it would be alliteration because the consonant S is present more than two times in a row. Alliteration is often found not only in poetry, but it is also found in works like advertisements and news headlines. They can also be seen as tongue twisters.