For this question we are working with a scenario in which we have P: FHLM T: GHJ
We are asked which of the members in the above scenario we would be allowed to replace with K.
If we try to replace H with K in the parks committee, we violate rule one, which disallows F and K serving on the same committee. If we replace H with K on the Trails committee, we violate the final rule that the committees have one member in common.
However, If K replaces G we have the following valid scenario