A group of scientists are studying a disease which is caused by contaminated food. The chemicals in this food cause harm to the body through interactions with the digestive and the immune systems. Which of the following are the scientists most likely to find in their research?

(A) When the contaminated food is eaten, the immune system prevents the harmful chemicals from entering the digestive system.

(B) The harmful chemicals enter the immune system through a break in the skin. The chemicals are then passed to the digestive system by the cardiovascular system.

(C) The harmful chemicals enter the digestive system through contaminated foods. Once in the body, the chemicals reduce the ability of the immune system to react to pathogens.

(D) The immune system transforms the harmful chemicals in the contaminated food into a different form of chemical, which is then broken down and absorbed by the digestive system.