Traces of canals have been found at Harappan site of ___________.

Shortughai

The correct answer is Option (3) → Shortughai

The reason traces of canals have been found at the Harappan site of Shortughai is due to the presence of an extensive and sophisticated water management system in the region. The Harappan civilization, which thrived around 3300 to 1300 BCE, was known for its advanced urban planning and infrastructure. At the Shortughai site, archaeologists have discovered evidence of canals, which were part of a systematic irrigation system. These canals were used to divert and manage water for agricultural purposes, which was crucial for sustaining the population and agriculture in the region. The presence of canals is indicative of the Harappans' understanding of hydraulic engineering and their ability to efficiently use water resources for agriculture, a key aspect of their civilization's success.

So, the correct option is [3].