Which of the following is the simplest form of carbohydrates?

Concept: Carbohydrates, or carbs, are sugar atoms. Other that proteins and fats, the carbohydrates are one of three fundamental supplements present in nourishments and drinks. The carbohydrates are broken down in the body and converted into glucose. 

The glucose, or blood sugar, is the major source of vitality for the cell of body, tissues, and organs. The simplest carbohydrates are those carbohydrates that are not able to break down to form sugars. The carbohydrate is a biomolecule that consists the carbon, hydrogen and oxygen atoms. This exists usually with a hydrogen-oxygen atom ratio of 2:1.

Therefore, the simplest form of carbohydrates is Aldehyde and Ketone groups.

Hence,the correct answer is option B.