Concept:Carbohydrates are organic compounds with the general formula
Cx(H2O)y, showing hydrogen and oxygen in a
2:1 ratio.
Explanation:Carbohydrates contain carbon, hydrogen, and oxygen.
In their structure, hydrogen and oxygen are present in the same proportion as in water.
So their general formula is
Cx(H2O)y.
This means the ratio of hydrogen atoms to oxygen atoms is always
2:1.
Proteins contain nitrogen and do not follow this fixed ratio.
Lipids have much less oxygen relative to hydrogen.
Vitamins have varied structures without a constant
2:1 hydrogen-oxygen ratio.
Therefore, only carbohydrates match the given condition.
Answer:B. Carbohydrates