The correct answer for matching the dams and the rivers they are constructed across is option 1.
Option 1: The correct sequence is 1 4 3 2.
Explanation:
- Dam A (Ukai) is constructed across the Tapti River (4).
- Dam B (Rana Pratap Sagar) is constructed across the Chambal River (3).
- Dam C (Thein) is constructed across the Ravi River (2).
- Dam D (Hiracud River) is constructed across the Mahanadi River (1).
Therefore, the correct sequence is 1 4 3 2, which corresponds to option 1.
Note: The answer provided is generally correct. No alert is required.