The correct answer is option 'D' - Vijayanagara.

Vijayanagara Empire was a prominent empire in South India during the 14th to 16th century CE. The empire was known for its architectural and cultural achievements. The construction of temples was an integral part of the empire's culture, and the temples were built with intricate carvings and sculptures. The Kalyana Mandapa was a notable feature in the temple construction during the Vijayanagara Empire.

Kalyana Mandapa:
- Kalyana Mandapa is a hall meant for conducting marriages and other auspicious ceremonies.
- It is a significant feature of South Indian temple architecture.
- The Kalyana Mandapa is usually situated in front of the main shrine or at a distance from it.
- The Mandapa has pillars with intricate carvings and sculptures.
- The roof of the Kalyana Mandapa is usually supported by pillars.

Importance of Kalyana Mandapa in Vijayanagara Empire:
- The Vijayanagara Empire was known for its patronage of art and architecture.
- The construction of temples was a significant part of the empire's cultural and religious identity.
- The Kalyana Mandapa was an important feature in the temple construction during the Vijayanagara Empire.
- The Kalyana Mandapa provided a space for conducting marriages and other auspicious ceremonies.
- The Mandapa was built with intricate carvings and sculptures, reflecting the artistic and architectural prowess of the empire.

Conclusion:
In conclusion, the construction of Kalyana Mandapas was a notable feature in the temple construction during the Vijayanagara Empire. The Mandapa provided a space for conducting marriages and other auspicious ceremonies and was built with intricate carvings and sculptures, reflecting the artistic and architectural prowess of the empire.

Kalyana Mandapas, meant to celebrate divine weddings, was a notable feature of the Vijaynagara Kingdom.