Answer:
D. Water
Step-by-step explanation:
Biotic factors are all living things, and they are derived from organisms. These include: fungi, plants, bacteria, archaea, protists, animals. 
Abiotic factors are all nonliving things, and they are not derived from organisms. These include: air, soil, light, water, minerals. 
In this case, grass, trees, and algae are all living things since they are derived from organisms. 
On the other hand, water is not a living thing since it is not derived from organisms. 
Let me know if this helps!