Starting from R, if all the persons are made to sit in the alphabetical order in clockwise direction, the positions of how many (excluding R) will remain unchanged?

T is second to the right of the person who studies in Standard VII and only one person sits between T and the person who studies in Standard V, => The one studies in Vth standard sits 2nd to the right of T. 

R studies in Standard V and there is one person between S and R, => S sits second to the right of R.

X is sitting third to the left of the person who studies in Standard VIII. The person studying in Standard VIII is not an immediate neighbour of the person studying in Standard VII. T does not study in Standard VIII, => X sits between T and R and S studies in standard VIII. 

W is sitting between the persons who study in Standard VII and Standard IV, => W sits to the immediate left of T and T studies in IVth standard.

X is second to the right of the person studying in Standard I, => W studies in standard I.

The person studying in Standard VI is to the left of U and U does not study in Standard V or Standard VIII, => U sits to the immediate left of W and the one who studies in standard VI sits to the immediate left of U. 

One of the immediate neighbours of the person studying in Standard VIII, studies in Standard II, => the one studying in IInd standard sits to the immediate left of S and thus X studies in standard III. 

Y does not study in Standard II, => V studies in standard II.

Starting from R, if all the persons are made to sit in the alphabetical order in clockwise direction, the position of only T will remain unchanged.

=> Ans - (D)