Your Aunt Gladys Has a Family History of Heart Disease

Your Aunt Gladys has a family history of heart disease. She decides to begin eating a bowl of oatmeal every morning to help lower her blood cholesterol. After about a month of following this routine, her cholesterol declined about five points. What is the most likely explanation for this effect? ​

A) Oatmeal is a low-fat food and inhibits the body's synthesis of cholesterol.
B) Oatmeal is high in complex fibers that inhibit cholesterol-synthesizing enzymes.
C) Oatmeal consumed on a regular basis suppresses the craving for high-cholesterol foods.
D) Oatmeal is high in soluble fibers that trap bile, causing the body to use more cholesterol for bile replacement.