Cellular respiration is a series of metabolic reactions that take chemical energy in the form of biomolecules (carbohydrates, lipids, or proteins) and use it to make energy in the form of ATP, and is a process that requires oxygen.
A simplified version of the reacción s the following:
[tex]C_6H_{12}O_6+6O2\to6CO_2+6H_2O+heat[/tex]
The reactants would be glucose and oxygen, so B would be the right answer.
