In which of the following pairs the second person is sitting on the immediate right of the first person ?

Sonty is third to the right of Titu and second to the left of Sonu. 

Chintu is not an immediate neighbour of Sonty or Titu, => Chintu sits to the immediate right of Sonu. 

Monu is second to the right of Chiku and is the immediate neighbour of Titu, => Monu is to the immediate right of Titu and Chiku is to the immediate left of Titu.

Bittu is not the immediate neighbour of Sonu, => Bittu sits to the immediate left of Sonty, and the vacant place, i.e. to the immediate left of Sonu is taken by Dhondu.

Only in the third pair, the second person  (Sonty) is sitting on the immediate right of the first person (Bittu).

=> Ans - (C)