The correct option is Bhaja.
Explanation
The development of rock-cut architecture in India, particularly Buddhist Chaitya grihas (prayer halls), flourished in Western India during the Post-Mauryan period (starting circa 2nd century BCE). These early structures are significant for imitating earlier wooden architectural styles in stone, featuring apsidal plans and vaulted roofs.
Detailed Analysis:
- Bhaja Bhaja: Correct. The Bhaja Caves (Pune district) date to the 2nd century BCE and represent the early Hinayana phase of Buddhist architecture. The main Chaitya hall (Cave 12) is a prototypical example of an apsidal vault-roof Chaitya. It features a long hall with a semicircular (apsidal) end, a vaulted roof supported by inward-sloping pillars, and wooden ribs (some original timber remains), clearly reflecting the transition from wood to stone construction.
- Kondivite Kondivite: Incorrect. Also known as the Mahakali Caves, these contain a Chaitya (Cave 9) with a distinct plan: a circular inner shrine containing a stupa attached to a rectangular hall. It does not follow the standard continuous apsidal vaulted hall design seen at Bhaja or Karle.
- Elephanta Elephanta: Incorrect. The Elephanta Caves are primarily Shaivite (Hindu) excavations dating to the mid-5th to 6th century CE (Gupta-Vakataka-Kalachuri era). They are pillared halls, not apsidal Buddhist Chaityas.
- Mahabalipuram Mahabalipuram: Incorrect. These monuments belong to the Pallava period (7th century CE). While the Nakula-Sahadeva Ratha has an apsidal back (Gajapristha style), it is a monolithic structural temple, not an early rock-cut cave Chaitya of the BCE era.
Key Takeaway:
Bhaja is one of the earliest surviving examples of a rock-cut Chaitya hall with an apsidal plan and a vaulted roof, notable for its imitation of wooden carpentry in stone.