1.
The answer is: A
Explanation
The correct option is A: Barren.
The word "prolific" means highly productive or fruitful, often in terms of producing a large amount of something, such as offspring, results, or creative works. The opposite of "prolific" would be a word that describes the lack of productivity or fruitfulness. "Barren" fits this description, as it means unable to produce offspring, results, or growth, and generally signifies a state of being unproductive or infertile.