The correct answer is C. Hydrocarbon.
Hydrocarbons are organic compounds that are composed of hydrogen and carbon atoms. They are the simplest type of organic compound and are found in many different forms, including oils, fats, waxes, and natural gas.
Carbohydrates are organic compounds that are composed of carbon, hydrogen, and oxygen atoms. They are the main source of energy for the human body and are found in foods such as bread, pasta, rice, and potatoes.
Proteins are organic compounds that are composed of carbon, hydrogen, oxygen, nitrogen, and sulfur atoms. They are essential for the growth and repair of tissues in the human body and are found in foods such as meat, fish, eggs, and dairy products.
Esters are organic compounds that are composed of a carboxylic acid and an alcohol. They are found in many different foods, including fruits, vegetables, and dairy products.
In conclusion, the correct answer is C. Hydrocarbon.