Which approach would be the most effective in deterring crop damage due to insects? 

A)  planting barrier hedges around agricultural fields 
B)  crop rotation 
C)  delay planting 
D)  planting monocultures

Crop rotation is the most effective approach in deterring crop damage due to insects. Insects tend to specialize in particular crops, and crop rotation disrupts their lifecycle and reduces their numbers, reducing the overall damage to the crops. Planting barrier hedges may initially deter insects, but they may eventually learn to overcome them. Delay planting may not be practical in some growing seasons, and monocultures are more vulnerable to insect attacks because insects can quickly spread throughout the entire crop.