Understanding synonyms is a key aspect of vocabulary and language comprehension. Synonyms are words that share the same or very similar meanings. The word "Abundant" describes something existing or available in large quantities; plentiful. It implies a surplus or a great deal of something.
Therefore, Plentiful is the correct synonym. If resources are abundant, it means there are plentiful resources, indicating a large and sufficient supply. For example, "The region has abundant wildlife" means "The region has plentiful wildlife." The other options are antonyms or words with opposite meanings. Scare (likely a typo for "scarce") means insufficient or rare. Limited means restricted in amount or extent. Rare means not occurring often or in large quantities. All these words convey a sense of lack or scarcity, which is the direct opposite of abundance.