Where the biggest Salt Mine located in Pakistan ?

Where the biggest Salt Mine located in Pakistan ?

A. Mangora
B. Jhelum
C. Sawat
D. none of these

The Khewra Salt Mine (or Mayo Salt Mine) is located in Khewra, north of d Dadan Khan, an administrative subdivision of Jhelum District, Punjab Region, Pakistan, which rises from the Indo-Gangetic Plain. It is Pakistan’s largest and oldest salt mine and the world’s second largest.