Correct Answer: Sanctum

Solution : The correct choice is the third option.

Explanation :

Sanctum is a term with rich connotations, specifically associated with sacredness, holiness, and places of worship. It is often used to denote the innermost, holiest part of a temple, church, or any other religious establishment. The word carries a sense of reverence and spiritual significance, making it a fitting choice for describing a sacred place.

Therefore, the correct one-word substitute is sanctum .

The meanings of the other options are as follows:

• Relic : This term typically refers to an object surviving from an earlier time, often considered to be of historical or cultural interest.
• Museum : This term refers to a place where artefacts and objects of cultural, historical, or scientific interest are exhibited.
• Retreat : This term generally refers to a place of seclusion or privacy.