Answer:
The correct answer will be option- B
Explanation:
Eyespot is the photo-receptive organ organelle which is found in the motile green algae and the unicellular organisms. The eyespot is also known as the "stigma" which helps the algae and Euglena to respond to light conditions.
The light-mediated perception by eyespot allows the movement of Euglena in response to the light either away or towards the light. The presence of light allows the Euglena to find a location to perform the photosynthetic reaction.
Thus, Option-B is the correct answer.