Option A is true, as it is just shuffling x and y
For Option B and D, we can have 3 kinds of cases.
Case 1: xRY, i.e x is below y in the lattice.
Case 2: yRx, i.e y is below x in the lattice.
Case 3: x and y are not related, but x and y have GLB and LUB as the structure is a lattice.
Try to draw the possible lattice structures and you'll get the conclusion.