Recommended Alley width in Alley cropping at least,

Answer: Option C

Alley cropping is a specific practice in which trees or shrubs and crops are grown in alternate rows. And these trees are commonly pruned to limit the shading of the agricultural crop. And one more thing that needs to be supervised is the width of the alley, it should be at least 3 meter.
Alley cropping helps in restoring soil fertility by nutrient cycling and erosion control.