The sentence containing a prefix is B) "She was ungrateful for his help," where 'un-' is a prefix meaning 'not'. Prefixes change the meaning of words by adding a level of negation or modification. In this case, 'ungrateful' indicates a lack of gratitude. ;
The sentence that contains a prefix is B) "She was ungrateful for his help," where the word 'ungrateful' includes the prefix 'un-' meaning 'not'. A prefix is added to the beginning of a word to modify its meaning. In this case, it indicates the opposite of gratefulness.
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