The correct completion for the analogy "Abundant : Scarce :: Artificial : Genuine" is Option 4.

In this analogy, we are comparing the relationship between two pairs of words. The first pair, "Abundant : Scarce," shows a relationship of opposites. "Abundant" means plentiful or in large supply, while "Scarce" means lacking in quantity or availability.

To maintain the same pattern, we need to find a word in the second pair that is the opposite of "Artificial." "Artificial" refers to something that is made or produced by humans, often to imitate or replicate natural things. The opposite of "Artificial" in this context would be "Genuine," which means real or authentic, not manufactured or artificial.

Therefore, Option 4, "Genuine," is the correct completion for the analogy.