Final answer:
A dictionary thesaurus helps identify alternate terms for a word, providing synonyms and antonyms which are important for vocabulary development and communication. So the correct answer is option C.
Step-by-step explanation:
The purpose of a dictionary thesaurus is to help identify alternate terms for a word. A thesaurus provides synonyms and sometimes antonyms, allowing users to find words with similar or opposite meanings, thus enhancing their vocabulary and precision in communication.
Over time, English dictionaries have evolved to not only include definitions and etymologies but also pronunciation guides, word usage advice, and updates to reflect the ever-changing nature of language.
Keeping up with new words entering the language and old words falling out of use is essential for effective communication. Printed and electronic forms of dictionaries, including internet resources and smartphone apps, are readily available for this purpose.