The correct option is Garbhagriha.
Explanation
The evolution of Hindu temple architecture saw significant development during the Gupta period. Temples transitioned from simple flat-roofed shrines to complex structures with distinct architectural components. The core of the temple remained the sanctum sanctorum.
Analysis of Options:
- Mandapa Mandapa: This refers to the pillared hall or assembly hall located in front of the main shrine. It was used for congregational worship, dance, and music.
- Garbhagriha Garbhagriha: Correct. Literally translating to "womb chamber," the Garbhagriha is the most important part of a Hindu temple. In early temple architecture, it was a small, dark, square room with a single doorway, where the main image of the deity was placed for worship.
- Shikhara Shikhara: This is the tower or spire that rises directly above the Garbhagriha. In North Indian (Nagara) style temples, it is curvilinear, while in South Indian (Dravida) temples, it is pyramidal (Vimana).
- Gopuram Gopuram: This refers to the monumental entrance tower, a prominent feature of the Dravidian style of temple architecture, which developed later than the early Gupta temples.
Key Takeaway:
The Garbhagriha is the sanctum sanctorum of a Hindu temple, serving as the central locus where the primary deity is installed.