Correct answer: (A) Kath-kuni alternates stone and timber layers.; (B) Nālukettu houses have courtyards.; (D) Bhunga has a circular plan.
Explanation
Kath-kuni uses timber-and-stone construction(A); a nālukettu organises four wings around a courtyard(B); a bhunga is circular(D). Ikra is associated with light timber/bamboo framing and infill in Assam, rather than the stone flat-roof description in C. Select A, B, D.