Which phonetic characteristic prohibits a vowel before the dot in the 'dots' rule?

The characteristic that prohibits a vowel before the dot in the 'dots' rule is rooted in the structural requirements of syllables. In many languages, a syllable must typically contain a vowel, as vowels are crucial to syllable formation. The 'dots' rule refers to a specific phonetic context where sounds are organized in relation to their placement in a syllable or a word.

In this context, if a vowel were to appear before a dot, it would disrupt the integrity of syllable construction. This is important because each syllable is fundamentally centered around a vowel, making it the nucleus of the syllable. If a vowel precedes the dot, it may lead to an instability in the expected vowel-consonant pairing that syllables require.

Therefore, understanding the function of vowels as central components to syllable structure clarifies why they cannot appear before the dot according to the rules of syllable formation in this specific phonetic context. The other options, while relevant to phonetics and syllable structure, do not directly address the constraints imposed by the 'dots' rule on vowel placement.