Choose the appropriate antonym for 'abundant'. 

The question is asking for an antonym, which means a word that has the opposite meaning, of the word 'abundant'. The word 'abundant' means plentiful or in large quantity. Out of the given choices, 'Scarce' is the most appropriate antonym for 'abundant'. 'Scarce' means lacking in quantity or not enough of something. Therefore, if something is 'abundant', there is a lot of it, but if something is 'scarce', there is very little of it.