The correct option is D All the above
Chlorosis is a condition of loss of the normal green coloration of leaves of plants due to insufficient chlorophyll for photosynthesis. Possible causes of chlorosis include poor drainage, damaged roots, compacted roots, high alkalinity, and nutrient deficiencies in the plant. The lack of iron is one of the more common nutrients associated with chlorosis. Manganese or zinc or magnesium deficiencies in the plant will also cause chlorosis. Deificient nitrogen or proteins may also cause chlorosis.
Thus, the correct answer is option (D).