Question

question 1 of 9
carbohydrates are organic compounds that primarily serve as an energy source. they are mainly composed of which three chemical elements?
carbon, nitrogen, and oxygen.
carbon, hydrogen, and oxygen.
carbon, sulfur, and hydrogen.

Explanation:

Carbohydrates are organic compounds with the general formula $C_x(H_2O)_y$, indicating they are mainly made of carbon, hydrogen, and oxygen.

Answer:

B. Carbon, hydrogen, and oxygen.