The correct answer is - A. One (1).
The southeastern part of Australia that is marked with the number 1 is by far the best suited for agriculture and that is due to multiple reasons:
- The sun radiation is neither too much, not too little, so it is the perfect amount for most of the plants to grow and produce;
- The precipitation levels are in higher amount, which means that the plants will be getting the required amount of water without any problem;
- The soil is of solid quality, with nicely redistributed soil layers in its profile, thus allowing the plants to have the required amount of nutrition for growth and high production.