A rotation of arable crops requiring annual cultivation and artificial pasture occupying field for two years or longer is termed as:

Correct option is C

Ley farming is a system where arable crops are grown in rotation with temporary pastures or leys, usually for 2 years or more. This helps in restoring soil fertility, improving soil structure, and breaking pest/disease cycles.
Alley cropping: Alley cropping is defined as the planting of rows of trees and/or shrubs to create alleys within which agricultural or horticultural crops are produced.

Intercropping:
· Inter-cropping is growing two or more crops simultaneously on the same field in a definite pattern.
· A few rows of one crop alternate with a few rows of a second crop.
· Example, soybean + maize, or finger millet (bajra) + cowpea (lobia).
· The crops are selected such that their nutrient requirements are different.
· This ensures maximum utilisation of the nutrients supplied and also prevents pests and diseases from spreading to all the plants belonging to one crop in a field.
· This way, both crops can give better returns.