The correct option is D Saccharomyces
Fermentation is an enzyme catalysed process, where organisms convert sugar to alcohol or an acid anaerobically. Saccharomyces cerevisiae, a unicellular fungi (yeast), is the most widely used organism in fermentation processes. It uses substrates such as grape juice, sugar cane, cereals, etc to produce alcoholic beverages like beer, wine, liquors, ethyl alcohol, etc.
Spirogyra is an alga that has many medicinal properties.
Entamoeba histolytica are pathogenic protozoans causing intestinal infections in human beings.
Amoeba is a unicellular protozoan that has an irregular shape and false feet called pseudopodia to capture food particles. They are usually found in water bodies.