Answer:
a. Producers, consumers, and decomposers will be affected.
Step-by-step explanation:
All the living beings, irrespective of their nutritional category, require water for survival. Water helps in digestion of food, serves as a medium for metabolic activities as well as maintain the body temperature.
Producers need water for photosynthesis and other vital life processes; consumers also need water for digestion and other metabolic processes. The process of decomposition requires the presence of moisture. Hence, water scarcity would affect all types of biotic components (Producers, consumers, and decomposers) of the ecosystem.