Explanation:
'Loud' can be an adverb in informal contexts (speak loud) but standard requires 'loudly'. However, 'fast', 'hard', 'late' are flat adverbs. So 'speaks loud' is acceptable; but many exams consider 'speak loudly' correct. I'll choose 'speaks loud' as incorrect in formal English. I'll adjust: 'She speaks loud' is often marked incorrect; correct is 'loudly'. I'll keep.
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