Final answer:
Mitochondria are the organelles responsible for releasing the energy required for the work of the cell through cellular respiration and the production of ATP.
Step-by-step explanation:
The correct answer is C. Mitochondria. Mitochondria are organelles found in eukaryotic cells that are responsible for releasing the energy required for the work of the cell. They are often referred to as the 'powerhouses' or 'energy factories' of the cell because they produce adenosine triphosphate (ATP), the cell's main energy-carrying molecule. Mitochondria use the chemical energy found in glucose and other nutrients through a process called cellular respiration to produce ATP.