If you are unsure of the root word in an unfamiliar term the best resource to use would be: a. thesaurus c. your teacher b. dictionary d. just guess

b. Dictionary

Explanation:

Dictionary is an edited word list organized in a book. In the dictionary, you can find lexemes and lexemic units, spelling and pronunciation of the word, translation...

In an etymology dictionary, you can find the meaning of the word, how it during the centuries. In this type of dictionary, there is information that includes the development of the word, its earliest recorded occurrence of words.

You should lookup for the root of a dictionary because you can find many useful pieces of information that can help you understand unfamiliar terms.