Final Answer:
A long growing season and irrigation make this region a rich farming area for corn and soybeans crops (option D).
Step-by-step explanation:
The region described, with its long growing season and reliance on irrigation, is most conducive to the cultivation of corn and soybeans. Corn (Zea mays) and soybeans (Glycine max) are warm-season crops that thrive in regions with extended growing periods and sufficient water supply. The combination of these factors, along with the adaptability of both crops to varied soil types, makes them ideal for cultivation in such a region.
Corn is a warm-season cereal grain that requires a frost-free period to reach maturity. Its extensive root system and ability to photosynthesize efficiently during the long growing season contribute to its successful cultivation in regions with adequate sunlight and warmth. Soybeans, on the other hand, are leguminous plants known for their nitrogen-fixing ability, enriching the soil and making them suitable for rotation with other crops. Additionally, soybeans benefit from warm temperatures and well-distributed rainfall or irrigation.
The use of irrigation in this region further supports the cultivation of corn and soybeans, ensuring a consistent water supply throughout the growing season. This practice enhances crop yields and contributes to the region's status as a rich farming area. In conclusion, the pairing of corn and soybeans aligns with the characteristics of a region with a long growing season and reliance on irrigation, making option D the correct answer.