Because it is said to contain the remains of Jesus Christ.
The answer is C 99.9% sure
Here's what I put. Hope fully it will help you out.
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The Gupta Empire was bordered by the White Huns, or the Hunas, who were trying to invade but the Gupta Empire successfully fought them off. This might have caused people to want to move, and from that causing the spread of ideas, such as math with the creation of 0 or the idea that the Earth is round and spins on an axis</span>