Answer:
The right option is D)Digestive system.
Step-by-step explanation:
Digestive System: The digestive system include the alimentary canal and all the organs and glands associated with the digestion and assimilation of food animals.
Digestion: This is the breaking down of food molecules into simple and absorbable form for use by the animals.
When sati opened her lunched bag, her salivary gland quickly produced a digestive enzyme called Ptyalin which is found in the mouth.
Hence the Organ system working in her body is the Digestive System.
The right option is D)Digestive system.