Ethanol soluble fraction of Humic acid is

Answer: Option D

Humic acids are the organic substances that coagulate when the strong base extract is acidified.
Humic acids are organic molecules with complex structures and functions and variable properties.
Fractionation of humus sample is done to determine its solubility and the fractionated materials are likely to be heterogeneous and a large amount of sample would be necessary for their analysis. The ethanol soluble fraction of Humic acid is Hymatomelanic acid.