The arrangement is Q-P-R. Therefore, P is sitting next to R.

With R between S and T, and U opposite R, T will be to the right of U.

Given that T is next to U and V is opposite T, W must be next to V.

With T to the left of U, and V opposite T, Y must be to the right of U in the arrangement.

Since X is between Y and Z, Z's left must be X in the circular arrangement.

Since X is between Y and Z, and W is opposite Y, the only person who can be next to W is Z.

Since Z is opposite X, and X is next to Y, Y must be next to Z.

Since Z is opposite Y and X is next to Y, the only person who can sit next to Z is B.

Since P is between Q and R, the arrangement can be visualized as Q-P-R. If S is opposite P, then T and U must be next to S. Thus, R is next to S.

If P is third to the left of Q, then counting clockwise, R is immediately right of P. Therefore, S must be opposite Q.

Starting from Q, if P is third to the left, we can determine R's position. R's position can then help us find the person directly opposite R, which is Q.

By placing Q at a position, we can determine P's position. R's position can then be calculated, leading to the conclusion that T is opposite Q.

Given J is between K and L, and M is opposite K, we can conclude that P is next to L.

Since J is between K and L, L is sitting next to K.

If J is three places away from K, there are two people sitting between J and K.

Since L is between M and N, and O is opposite L, N must be to the right of O.

If L is to the right of M, then O must be to the left of M, as N is opposite L.

Since L is to the right of M, and N is opposite L, M must be to the left of N.

Since L is not next to M, it is possible for P to be next to L, making this statement true in some arrangements.

N is between O and P, so N is next to P. L and M being opposite does not affect this arrangement.

M is between N and O, so O is next to M, making M the answer.

With M opposite N and O to the right of M, P must be to the left of N, completing the arrangement.

The arrangement can be visualized as M-N-P-O-Q-R-S. Therefore, P is sitting opposite N.

With M to the right of N, we can visualize the arrangement. O's position opposite M helps us determine that Q is to the left of N.

Since R is opposite P and P is next to Q, Q is sitting next to R.

Since R is between S and T, and U is opposite S, T must be next to U.

Since R is to the left of S, R is also to the right of S, making R the one sitting to the right of S.

Since T is between U and V, U is next to V. W being opposite T does not change this adjacency.

Since T is between U and V, the person sitting next to U must be V.

The arrangement does not provide enough information to determine who is opposite X.