The correct option is D Spirogyra
A spirogyra is plant-like filamentous green algae (because of the presence of chlorophyll, which allows it to make its own food).
Amoeba is an unicellular protozoa. Euglena is a photosynthetic protist that requires mixotrophic nutrition.
Chlamydomonas is an unicellular, flagellated green algae.