Question

a macromolecule made of carbon, hydrogen, and oxygen that cells use for energy
carbohydrate
catalyst
cell
cell cycle

Explanation:

Carbohydrates are macromolecules with C, H, O (ratio ~1:2:1) used for energy. Catalysts speed reactions, cells are units, cell cycle is cell division process—none match the description except carbohydrate.

Answer:

A. carbohydrate