The correct option is C Amit and Umran or Amit and Bharani
From the given statements the arrangement can be shown as:
Bharani/Umran Dhruv/Vinay Tariq Umran/Bharani
Amit Dhruv/Vinay Sohan Chetan
Thus, the pair sitting diagonally opposite to each other is: Amit and Bharani or Amit and Umran