Choice "D" is correct. Real property includes land and all items permanently affixed to the land (e.g., buildings, paving, etc.)
Choice "a" is incorrect. Real property includes more than just the land (as per the explanation above); it includes all items permanently affixed to land.
Choice "b" is incorrect. "All" tangible property could include moveable personal property and is therefore, incorrect.
Choice "c" is incorrect. "Intangible property in realized form" is a distracter and a contradiction in terms.