Answer: c. fiber
Explanation:
The fibers in the diet obtain from the vegetables and fruits. The fibers are necessary to increase the bowel content for a considerable period of time and it increases the water intake in the body. This makes the fecal matter smooth and prevents the constipation.
The added sugars, saturated fats and trans fat all contributes to increase the levels of bad cholesterol in the body.
T cells attack antigens on foreign substances and B cells produce antibodies.
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