The correct option is A Glucose
Carbohydrates (also called saccharides) are molecular compounds made from three elements: carbon, hydrogen and oxygen. Monosaccharides (e.g., glucose) and disaccharides (e.g., sucrose) are relatively small molecules. They are often called sugars. Other carbohydrate molecules are very large polysaccharides such as starch and cellulose.
Carbohydrates are the compounds made up of carbon, hydrogen and oxygen. Monosaccharides are the simplest form of carbohydrates. They are formed by one sugar molecules. example- glucose, fructose etc.