No supporters of 'party X', who knew Z and supported his campaign strategy, agreed for the alliance with 'party Y'; but some of them had friends in 'party Y'.

With reference to the above information, which one among the following statements must be true?

Correct Option: There is at least one supporter of 'party Y' who knew some supporters of 'party X' as a friend.

Let S be the set of supporters of 'party X' who knew Z and supported his campaign strategy. The premise states: "some of them [referring to this specific group S] had friends in 'party Y'." If some members of group S have friends in 'party Y', it logically implies that there is at least one supporter of 'party Y' who is a friend of (and thus knows) a supporter of 'party X' from group S. Friendship is a mutual relationship, meaning there must be at least one supporter of 'party Y' who has a friend in 'party X'. Option A cannot be deduced because we do not have information on how 'party Y' supporters felt about the alliance. Options C and D directly contradict the premise, which assumes that there exists a group of 'party X' supporters who knew Z and supported his strategy. Hence, Option B must be true.