Which of the following correctly describes the structure of a chloroplast?

• A. A chloroplast has three membranes and contains only thylakoids.
• B. A chloroplast is surrounded by a single membrane and contains only stroma.
• C. A chloroplast has a single membrane and contains grana and stroma.
• D. A chloroplast is surrounded by two membranes and contains thylakoids and grana.

Answer: (D)