Seclee is the region within
Why this is right
This proves the claim by making Martown a subset of Seclee. Los Angeles is a subset of California, so if you put 20 trees in LA, then you have at least 20 trees in California. Every tree in Martown is by definition also a tree that in Seclee. So Seclee has to have at least as many trees. If there are other cities besides Martown that are within the region of Seclee (and those other cities also have trees), then Seclee is guaranteed to have more trees than Martown. If Martown is the only city within the region of Seclee, and all of Seclee's trees are found within Martown, then Seclee is guaranteed to have the same number of trees as Martown. Either way you slice it, Seclee as at least as many as Martown.
Skill tested: Sufficient Assumption · how this choice captures the argument's function is the move to repeat next time.