Algal blooms impart a distinct colour to water due to

Options

A. their pigments
B. excretion of coloured substances
C. formation of coloured chemicals in water facilitated by physiological degradation of algae
D. absorption of light by algal cell wall

Explanation

Algal bloom impart distinct colour to water due to their pigmens. Pigment composition of several groups of algea.
`{:("Green algae",-,"Chlorophy- b"),("Brown algae",-,"Chlorophyll-"C_(1)+C_(2) "fucoxanthin"),("Yellow algae",-,"Chlorophyll-"C_(1)+C_(2)"fucoxanthin"),("Red algae",-,"Phycoertythrin phycoyani"),("Blue algae",-,"Phycoerythrin phycoyanin"):}`