Explanation:

- Many Harappan seals are known for their intricacy and craftsmanship.

- The seals often feature animals, inscriptions, and various symbols.

- The primary material used to make these seals was steatite, also known as soapstone, which is soft and easily carvable.

- Bricks were used widely in Harappan architecture but not for seal-making.

- Granite is a hard stone that was not typically used for such detailed carvings in Harappan seals.

- Brass is a metal alloy and not used for Harappan seals, as it was rare and more difficult to intricately work with during that time.