Without the illustration, it's challenging to provide a definitive answer. However, I can correlate potential answers with common human body systems:
- A. It transports substances throughout the body. - This is likely describing the circulatory system.
- B. It obtains nutrients. - This would refer to the digestive system.
- C. It protects the body from disease. - This relates to the immune system.
- D. It eliminates carbon dioxide gas. - This is associated with the respiratory system.
If you can specify which body system is illustrated, I can help you determine the correct function.