Sucrose is b) disaccharide.
Explanation: Sucrose is a type of sugar that is commonly found in many plants. It is made up of two simpler sugars, glucose and fructose, which are linked together. Because it consists of two monosaccharides (glucose and fructose), it is classified as a disaccharide. In the context of carbohydrates, monosaccharides are single sugar units, disaccharides are formed from two units, trisaccharides from three, and polysaccharides consist of many sugar units. Therefore, sucrose falls into the disaccharide category due to its composition.