I can't figure out the answer

Answer:
B Paramecia
Explanation:
Paramecia are slipper-shaped and nearly see through, which poses for a difficult time when trying to see them in the beakers of cloudy water. Paramecia are covered in a protective pellicle that functions like skin and protects them from the elements. On the edges of the pellicle are the cilia, or tiny hair-like structures.
Hope this Helps!