Explanation:

- Option 1: Rhodophyceae

- Rhodophyceae is the scientific term for red algae.

- They contain pigments like phycoerythrin which give them a reddish color.

- Option 2: Chlorophyceae

- This refers to green algae, not red.

- Chlorophyceae have chlorophyll a and b, giving them a green hue.

- Option 3: Liverwort

- Liverworts are a group of non-vascular plants, not algae.

- They are part of the bryophytes, more akin to mosses.

- Option 4: Phaeophyceae

- This is the class for brown algae.

- Contain fucoxanthin, which gives them a brown color.