Correct Option: D

The vast majority of the beads are made of fired steatite , which was a widely used raw material, beginning with the Ravi period and continuing through the Late Harappan period. Beads that are made of hard stone, such as Agate, Carnelian, are relatively less common, with a significant drop in numbers for stones, such as Lapis Lazuli, Grossular Garnet, Serpentine and Amazonite.