Correct option is C
P and T are sitting at the extreme ends of the row.
P/T, _, _, _, P/T
Neither Q nor S sit at the exact central position of the row.
P/T, Q/S, _, Q/S, P/T
R is adjacent to S.
P/T, S, R, Q, P/T or P/T, Q, R, S, P/T
R is sitting at the exact central position of the row.