- In the photosynthesis process carbon dioxide / water / sunlight has the role of raw material
- If something is a raw material in a process then that something is required for that process
- Therefore, sunlight is required for photosynthesis

- Green plants are a kind of producer
- Green plants provide food for themselves / animals / consumers by performing photosynthesis
- So, producers provide food for themselves by performing photosynthesis

- Sunlight is required for photosynthesis
- Producers provide food for themselves by performing photosynthesis
- Therefore, sunlight is required for producers to provide food

- Sunlight is required for producers to provide food
- If something is required by a living thing for a process then increasing that something will increase that living thing's ability to perform that process
- Therefore, increasing sunlight will increase a producer's ability to provide food

- Increasing sunlight will increase a producer's ability to provide food
- Summer has the most sunlight
- Therefore, producers provide the most food during summer

Hence, producers provide the most food during summer
Q: When can producers make the most food?
Context:
- Summer has the most sunlight 
- If something is required by a living thing for a process then increasing that something will increase that living thing's ability to perform that process 
- Green plants are a kind of producer 
- Green plants provide food for themselves / animals / consumers by performing photosynthesis 
- In the photosynthesis process carbon dioxide / water / sunlight has the role of raw material 
- If something is a raw material in a process then that something is required for that process