Which fruit is harvested fully ripe and does not ripen further after picking?

The correct answer is strawberries because they are classified as non-climacteric fruit. This means that once they are harvested, they do not continue to ripen. Strawberries must be picked at their peak ripeness to ensure the best flavor and sweetness, as they will not develop these qualities after being removed from the plant.

In contrast, bananas and apples are climacteric fruits, which means they continue to ripen after being picked due to the production of ethylene gas. This allows them to mature and develop better flavors and textures post-harvest. Citrus fruits also follow a similar pattern, as they can improve in sweetness and juiciness after being harvested. This is why they are not suitable choices for the question, as they do not share the same characteristics as strawberries regarding ripening after harvest.