He harvested a rich crop from that fecund land.

The correct answer is A. Fertile.

Fertile land is land that is good for growing crops. It is usually rich in nutrients and has good drainage.

Obsolete means no longer used or relevant.

Barren means not producing anything.

Fruitless means not producing any fruit.

In the sentence “He harvested a rich crop from that fecund land,” the word “fecund” means fertile. This is because the land is producing a rich crop, which is a sign of fertility. The other options are not correct because they do not describe the land as being good for growing crops.