Seven kids Px, Qx, Rx, Sx, Tx, Ux, and Vx are sitting in

Solution

 Vx is sitting exactly at the middle and Tx is sitting third to the right of Vx.  Since only Qx is sitting between Sx and Tx, this means Sx must be to the immediate right of Vx.  Only three kids are sitting between Px and Sx. This means Px is at the extreme left and Ux/Rx can interchangeably occupy the remaining two positions. Final arrangement is shown below: From above arrangement, it is clear that ‘Px’ is sitting at the extreme left end. Hence, the correct answer is (D).