Final answer:
The digestive, nervous, and respiratory systems worked together to help James realize he was hungry and ready for dinner. Hence, option A, B and C are correct.
Step-by-step explanation:
The body systems that worked together to help James realize he was hungry and ready for dinner were the digestive, nervous, and respiratory systems.
When James smelled the food cooking, the olfactory receptors in his nose detected the odor molecules and sent signals to his brain through the nervous system. The brain then processes these signals and triggers the production of saliva in the salivary glands, preparing the body for digestion.
Simultaneously, James may have also experienced an increase in breathing rate, as the smell of food can stimulate the respiratory system. This increased breathing rate helps deliver oxygen to the cells involved in digestion, supporting the digestive process.