Which macromolecule is made of only carbon, hydrogen, and oxygen and is used as short term energy storage for building the structural components of living things?
A. lipid
B. protein
C. nucleic acid
D. carbohydrate

A macromolecule that is composed of only carbon, hydrogen, and oxygen and is specifically used as a short-term energy source for building the structural components of living things is Carbohydrates.  

Carbohydrates are one of the biomolecules that are made up of only elements such as Hydrogen, Carbon, and Oxygen. Each molecule’s type has its unique specific function. Some significant functions of carbohydrates are mentioned as follows:

Thus, we can conclude that the correct answer is carbohydrates and thus, option D is the correct answer.

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