Which research source would you use to find the origin of the word sophomore?

Athesaurus
BFrench textbook
Cgrammar textbook
DOxford English Dictionary

Verified Answer :

DThe Oxford English Dictionary

Dictionaries include word origins.
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DOxford English Dictionary; which should explain the etymology behind the word. A lexicon is used to define a word and a thesaurus is used for synonyms and antonyms of a specific word. Lastly a French textbook would teach a beginner french words and a grammar textbook for rules of common punctuation and proper syntax and diction.