Where do the light and dark reactions of photosynthesis primarily occur?

• A. Light Reactions: Stroma; Dark Reactions: Thylakoid
• B. Light Reactions: Intermembrane space; Dark Reactions: Granum
• C. Light Reactions: Granum; Dark Reactions: Intermembrane space
• D. Light Reactions: Thylakoid; Dark Reactions: Stroma

Answer: (D)