Respuesta :
The type of the resource most effective to use as per the given situation is Thesaurus.
What is Thesaurus?
Thesaurus refers to the book which contains the list of the words which has synonyms and related meanings and concepts. It helps to enrich the vocabulary. It also includes the antonyms which are very helpful for us remember the meaning and learn more extra words.
In the above situation, Sandra is repeating the same words again and again in the essay. So her teacher recommended her the book of Thesaurus so that can enrich her vocab and make better use of the words in her essay writing.
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