Final answer:
The utterance that does not follow correct SALT spelling conventions is C I hafta listen.
Step-by-step explanation:
The utterance that does not follow correct SALT spelling conventions is C I hafta listen.
In this utterance, the word 'hafta' is spelled incorrectly. The correct spelling is 'have to'. 'Hafta' is an informal contraction that is not considered standard.
It is important to use correct spelling conventions in order to communicate effectively and adhere to proper grammar and language usage rules.