Building 'Kalyaana Mandapas' was a notable feature in the temple construction in the kingdom of

1. A

   Chalukya

   (a) Chalukya. Early and later Chalukya temples are known for cave and structural vimanas (Badami, Pattadakal, Aihole), not as the classic home of kalyana mandapas, so this is not the key.

2. B

   Chandela

   (b) Chandela. Khajuraho nagara temples are famed for sculptural density, not kalyana mandapas as a hallmark, so this is not the key.

3. C

   Rashtrakuta

   (c) Rashtrakuta. Ellora’s Kailasa and other rock-cut work define them; kalyana mandapa is not their signature, so this is not the key.

4. D

   Vijayanagara

   (d) Vijayanagara. Large open kalyana mandapas (marriage halls) with ornate pillars are a notable feature of Vijayanagara temple additions (Hampi, Vithala, and successor Nayaka work). That kingdom is the official key.

Summary. Official key is (d) Vijayanagara. From the fourteenth century the Hampi complex and later Nayaka temples added spacious pillared kalyana mandapas for ritual marriage of the deity. Chalukya, Chandela and Rashtrakuta styles are identified by other hallmarks. Honour the stored letter (d).