Which one of the following is a motile unicellular organism with a single cilium and can exist as an autotrophy, as well as a saprotroph?

Euglena is a unique unicellular organism that exhibits both plant-like and animal-like characteristics. It contains chloroplasts for photosynthesis (autotrophy) in the presence of light but can also absorb nutrients from its environment (saprotrophy) in the dark. It moves using a long, whip-like flagellum (referred to here as a cilium).