I ____________ any word he utters.

Explanation

Option A is correct because the present simple negative 'do not believe' is used to express a general disbelief. Option B is incorrect as it uses the third-person singular form, which does not agree with the first-person subject 'I'. Option C is wrong because 'am not believing' is not typically used in English for stative verbs like 'believe'. Option D is incorrect since 'will never believe' refers to future disbelief, which changes the meaning.