Statement (B) is correct as most houses were built around a central courtyard.
Statement (D) is also correct as the houses had no windows along the ground-level outer walls for privacy and safety.
(A) is incorrect because the main entrance did \textit{not} give a direct view of the interior or courtyard.
(C) is incorrect as staircases were found in some houses.
(E) is incorrect because houses had their own private bathrooms.
Correct statements: Courtyard with rooms on all sides, and no windows in the ground-level walls.