The largest man made lake in Pakistan is

Keenjhar Lake also known as Kalri Lake is the biggest man made freshwater lake in Pakistan. It was formed by the union of two smaller lakes and today provides drinking water to Karachi and Thatta while also supporting fisheries. The lake serves as a popular tourist spot and a sanctuary for migratory birds. Its scale and economic importance make it stand out among Pakistan major water bodies. The correct answer is therefore option C Keenjhar Lake.