Concept:Garbhagriha is the innermost chamber of a Hindu temple, known as the sanctum sanctorum.Explanation:It is the most sacred room inside the temple. The main deity's image is placed here. Originally, it was a small cubicle with only one entrance. Later, it became larger. This chamber is the focus of all major rituals. Other parts of the temple include the mandapa (assembly hall) and the shikhara or vimana (tower above). A stupa is a different religious structure, not related to the garbhagriha.Answer:Option D: the room where the image of the temple deity is placed.