The correct answer is Soluble fiber.
Complex carbohydrates are made up of long chains of sugar molecules and include polysaccharides like starches and fibers. While high-fructose corn syrup is a sweetener made from simple sugars, glucose is a simple sugar. Lactose is a disaccharide, which consists of two sugar molecules. Soluble fiber, on the other hand, is a complex carbohydrate that comes from plant sources.