Why might soils rich in organic matter not be fertile?
a.
soil fertility comes from a balance of organic matter and other mineral nutrients.
b.
large amounts of organic material make soil retain too little water.
c.
soil fertility is a result of the inorganic minerals present.
d.
soils rich in organic material are always highly fertile.

The correct answer is (a) Soil fertility comes from a balance of organic matter and other mineral nutrients.

The reason for a soil to be fertile is that, there must be a balance of organic matter and other mineral in soil. In addition to organic matter there must be the pressence of adequate amount of nutrients and minerals in soil. The nutrients such as nitrogen, potassium, phosphorous, calcium, iron, sulfur, magnesium and other should be present along with the organic matter to make the soil fertile. Balance of all the macro and micro nutrients along with organic matter makes a soil fertile.