The correct option is D Extracts of garlic and neem
In organic farming, there is minimal or no use of chemical fertilisers, herbicides and insecticides. Instead of chemicals, natural things can be used as an alternative to insecticides. Extracts of garlic and neem leaves can be used which are natural repellents for insects and pests.
Scarecrows are used to discourage birds and also animals from disturbing and feeding growing crops.