The correct option is A Mitochondria and chloroplasts
In a eukaryotic cell, energy transformation reactions majorly occur in cytoplasm, mitochondria and chloroplast. In cytoplasm, the energy is captured and used to produce ATP by substrate level phosphorylation during glycolysis. In mitochondria, the energy is captured and used to produce ATP by oxidative phosphorylation. In chloroplasts, the energy is captured and used to produce ATP by photophosphorylation. Thus, two cell organelles involved in energy transformation reactions are chloroplast and mitochondria.