उजनी धरण जलाशय व कोयना धरण जलाशय यांना अनुक्रमे __ व __ या नावांनीही संबोधले जाते.

The correct answer is Option D (यशवंत सागर व शिवाजी सागर).

Key Points:
• The key concept is the official names of important reservoirs in Maharashtra.
• Major dams in Maharashtra have specific honorific names for their reservoirs.
• The reservoir formed by the Ujani Dam (on the Bhima river in Solapur) is officially named 'Yashwant Sagar' (after Yashwantrao Chavan).
• The massive reservoir formed by the Koyna Dam (on the Koyna river in Satara) is officially named 'Shivaji Sagar' (after Chhatrapati Shivaji Maharaj).
• Therefore, the respective names are Yashwant Sagar and Shivaji Sagar.
• Key Takeaway: Reservoirs: Ujani Dam = Yashwant Sagar; Koyna Dam = Shivaji Sagar.