Farming without the use of chemicals.
Organic farming
The correct option is A.
Explanation of the correct option:
Explanation of the incorrect option:
Option B:
Hydroponics is a method of growing plants without soil.
Option C:
Intercropping is the method of growing two or more crops simultaneously in the same field.
Option D:
Natural farming is a method where neither chemicals nor organic fertilizers are added to the soil.
Final answer: Farming without the use of chemicals is organic farming.