Correct option is A
Sotka-Koh is an important Harappan (Indus Valley Civilization) site located in Baluchistan, specifically in the Makran coastal region (now in Pakistan).
It is considered a Harappan port town and provides evidence of maritime trade, possibly with the Mesopotamian world.
Rahman Dheri – Located in Khyber Pakhtunkhwa, Pakistan; pre-Harappan site.
Gumla – Located in Jharkhand, India, but not a Harappan site.
Mundigak – Located in Afghanistan, associated with the Helmand culture, not the core Harappan civilization.