Let's see what you already know about reference materials. Look at the word vintage in the advertisement. Which reference material would be most helpful for determining the meaning and part of speech of this word? an advertisement featuring the words "vintage outfitter," "original," and "authentic denim" A. glossary B. dictionary C. thesaurus D. encyclopedia

The reference material that would be most helpful for determining the meaning and part of speech of the word "vintage" is:

B. dictionary.

Explanation:

The dictionary is the best reference material when it comes to learning the meaning and part of speech of a word. Let's take a look at an online dictionary entry for the word "vintage":

VINTAGE

adjective  

of high quality and lasting value, or showing the best and most typical characteristics of a particular type of thing, especially from the past.

The entry reveals which part of speech the word "vintage" is right from the get-go: adjective. Then, it offers us the explanation for its meaning. We now  know that something that is vintage presents either high quality or some characteristic related to the past. Therefore, the best option among the ones provided in the question is: B. dictionary.