Step 1: Understanding the rule.
The given phonological rule is:
\[
\left[ -sonorant \right] +voiced \rightarrow \left[ -sonorant \right] -voiced / __ \#
\]
This means that the rule applies to non-sonorant sounds with a voiced feature, which should turn into non-sonorant and unvoiced when they occur at the end of a word.
Step 2: Analyzing the options.
- (A) [dud]: This conforms to the rule. "d" is a non-sonorant consonant, and "d" is voiced at the beginning of the word, which can become unvoiced at the end of the word.
- (B) [kut]: This conforms to the rule. "k" is a non-sonorant consonant, and the sound stays unvoiced.
- (C) [mutab]: This does not conform to the rule. "b" is a voiced non-sonorant sound, but it does not become unvoiced at the end of the word, which violates the phonological rule.
- (D) [pum]: This conforms to the rule. "p" is unvoiced, so the rule does not apply, but no violation occurs.
Step 3: Conclusion.
The correct answer is (C) [mutab] as it does not conform to the phonological rule.