Farmers make a great effort to prevent fungi from growing on their stored crops. In a pile of grain or nuts, fungi have plenty of food and living space. The best way for farmers to prevent fungi from growing is to make sure there is not enough ? for fungi to survive and grow.

The correct answer is - water/humidity/nutrients.

Explanation:

Fungi grow in moist or humid places or conditions with the proper amount of water and nutrients. These organisms lack chlorophyll so they require any organic matter or saprobes for their nutrients.

All these factors are important for the growth of fungi however, the most important factor is water. Farmers must prevent water or nutrients to be collect that provide a surviving and growth environment for the fungi.