Context clues are hints, words, or even phrases, that are given by writers to be able to define, or help a reader define, a hard concept or word in a simple way without having to always resort to a dictionary. Usually, these hints are given before the term, but sometimes, they can be defined afterward with the context of further words or sentences. There are 6 types of context clues: definition or explanation, restatement, or synonym clues, contrast, or antonym clues, inference or general context clues, and finally, punctuation clues. In this particular case, we can infer that "sufficient" means what will be considered enough to fulfill the needs of the people, because of the words that are used before it "so much", "must be given" and finally "enable". This is a case of a inference, or general context clue, because you need more than just one word to infer the meaning of the difficult term, meaning, an understanding of the context at large within the sentence to infer the information. So the correct answer here would be None of the Above.
