​_________ has a curving shape, a feature found in Nagara architecture.​

Correct option is A

The correct answer is (A) ​Shikhara.

• The shikhara is a curving feature of Nagara architecture.
• The shikhara is a mountain-like spire that's a prominent part of North Indian temples. 
• The word "shikhara" comes from Sanskrit and literally translates to "mountain peak". 
• In Nagara architecture, the shikhara is curvilinear and centered over the sanctum. 
• The most common type of shikhara is the "latina" or "rekha-prasada" type, which has a square base and walls that curve inward to a point at the top. 
• Incorrect options explanation:
• An antarala is a small antechamber or vestibule in Hindu temples that connects the inner sanctum to the pillared hall.
• A mandapa is a pillared hall or pavilion in Indian temple architecture that serves as a sacred space for worship, ceremonies, and gatherings. It is often the main hall of the temple and is where devotees gather to worship the deity.
• The kutina is a type of Indian temple spire that is pyramidal in shape and has stepped stories. The stories are each meant to resemble the main story and have their own "wall" surrounded by a parapet. The parapet is made up of miniature shrines that are strung together. Variant forms of the kutina are found in Karnataka and Andhra Pradesh.