Respuesta :
The answer is option a, that is "The stamps were carved out pure limestone".This sentence is false because the stamps were actually made of another kind of rock such as stearite which is a magnesium-rich rock composed of mineral talc and some of them are also made of silver or calcite.
The attribute which was not common of Indus Valley stamp seals is that the stamps were carved out pure limestone. Option A is correct.
The stamps were made generally of another type of rock: stearite (a magnesium-rich rock composed of mineral talc.
The Indus Valley Civilisation (IVC) was a Bronze Age civilisation in the northwestern regions of the Indian subcontinent, which protracted from 3300 BCE to 1300 BCE.