The correct answer is mitochondria.
Aerobic respiration requires oxygen to function. The majority of the chemical activities taking part in the procedure occur in tiny objects within the cell cytoplasm, known as mitochondria. The energy discharged by respiration is utilized to produce big molecules from smaller ones.
More specifically, the process of aerobic respiration in eukaryotes takes place in the mitochondrial matrix or within the inner mitochondrial membrane of mitochondria.