Question

vocabulary: reference material
dictionary - contains a long list of words and their many definitions

• organized in alphabetical order
• provides the part of speech of the word

glossary - contains a list of words and definitions located at the back of a textbook

• author provides the definitions of words that the reader may not know
• only one definition in the context the word is used

thesaurus - contains a list of synonyms and antonyms

• synonyms: words with similar meanings
• antonyms: words with opposite meanings
• a short definition is sometimes provided

which reference material would you use to find the antonym of a word?
glossary
thesaurus
dictionary

Explanation:

The thesaurus is defined as containing a list of synonyms and antonyms (along with sometimes a short definition). A glossary provides definitions of words in a textbook's context (one definition per word's use there), and a dictionary gives multiple definitions and part of speech, not antonyms. So to find an antonym, a thesaurus is used.

Answer:

B. thesaurus