Which among the following factor/factors have led to the extensive development of dairy farming in the dairy belt of North America?Hot and humid climateRainfall varying between 55 and 125 cm.Select the correct code from the options given below:

• A. Only 1
• B. Only 2
• C. Neither 1 & 2
• D. Both 1 & 2

Answer: (B)

Extensive development of dairy farming in the dairy belt of North America has been possible due to the presence of a combination of physical and economic factors. The region receives a rainfall varying between 55 and 125 cm. The rainfall efficiency is further increased by relatively lower temperature ranging between 18° and 24°C. The cattle yield more milk in a cool climate and the milk can also be kept for a longer time at lower temperature.