Which among the following materials was used in making the Harappan seals?

Harappan seals were predominantly made of steatite (soapstone), a soft stone that was easy to carve. The seals typically depicted animals like the unicorn, bull, elephant, and rhinoceros, along with the undeciphered Indus script. Steatite was preferred because it could be easily engraved and then hardened by heating. Other materials like sandstone, lapis lazuli, and jasper were used for beads and ornaments but not primarily for seals.