Which of the following statements about chloroplasts and mitochondria is true?

• A. Mitochondria, but not chloroplasts, contain a small amount of DNA.
• B. Chloroplasts and mitochondria are components of the endomembrane system.
• C. Chloroplasts and mitochondria have three sets of membranes.
• D. Chloroplasts, but not mitochondria, are completely independent of the cell of which they are a part.
• E. Chloroplasts and mitochondria synthesize some of their own proteins.