Your answer would definitely be D - Mitochondria. Mitochondria is the organelle that supplies all the energy for a cell. Hope I was helpful, have a good day! 8)
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Hope this helps...
Liver would be the answer. Hope this helps. :)