the answer could not be D because a Golgi Apparatus  is a tiny structure, or organelle, in a cell that "packages" nutrients for use inside the cell. The answer could not be c. because a nucleus  is a tiny structure, or organelle, in a cell that "packages" nutrients for use inside the cell. The answer could not be  Endoplasmic Reticulum because that is where proteins are transported from one part to the other. So the only answer left is Mitochondria, because the Mitochondriamain function is to produce ATP, the energy currency of the cell.
