Final answer:
To divide the word "unique," the Open syllable principle (C) would be used, resulting in syllables u-nique with a long vowel sound for the 'u.'
Step-by-step explanation:
The principle you would use to divide the word "unique" is the Open syllable principle (C). This is because the word has two syllables with the first syllable ending in a vowel and the second syllable starting with a consonant. The open syllable principle states that when a syllable ends in a vowel, the vowel is usually long. The word is divided into syllables as follows: u-nique. Since 'u-' is an open syllable (ending in a vowel), the 'u' has a long vowel sound.