The best and authentic source to locate the origins of the word is given in option (a): "dictionary"
Why is a dictionary a best source?
Dictionaries encourage you to pay attention to what you eat as well as your own curiosity.
In addition to its primary role of defining words, a dictionary may contain information regarding their grammatical forms, pronounciation, syntactic idiosyncrasies, functions, etymologies, antonyms, and variant spellings.
The Thesaurus and internet comes up with similar nature of the words, they have various resources associated with the word rather than the origins.
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