I can't see the image you're referring to, but I can help guide you based on the options you've provided. Here's a brief explanation of each function:
A. It transports substances throughout the body. - This is typically a function of the circulatory system.
B. It obtains nutrients. - This is usually associated with the digestive system.
C. It protects the body from disease. - This is mainly the function of the immune system.
D. It eliminates carbon dioxide gas. - This is a function of the respiratory system.
If you can identify which body system is illustrated, you can select the corresponding function from the options above. For example, if it's the circulatory system, the answer would be A. If it's the respiratory system, then D would be the answer.