While Kalibangan and Banawali both feature fire altars, what is the key structural and contextual difference in how these ritual structures were integrated into their respective urban layouts?

Options:

• A: At Kalibangan, fire altars were located on elevated public platforms as well as in domestic households, whereas at Banawali, they were found within a unique apsidal temple-like structure and domestic rooms.
• B: At Kalibangan, fire altars were exclusively used for disposal of the dead, whereas at Banawali, they were used solely for metal smelting.
• C: At Kalibangan, fire altars were circular and made of imported marble, whereas at Banawali, they were rectangular and made of sun-dried mud bricks.
• D: At Kalibangan, fire altars were confined to the lower town residential quarters, whereas at Banawali, they were restricted to the outer defensive walls.

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