1. sid of sailor , who is a sailor and there exist a reserve tuple r such that r.sid = s.sid and there exist a boat b whose boat id is same as sailor reserved and whose color is red. => i think this is true
2. sid of sailor , there exist a reserve tuple r and there exist a boat tuple b such that r.sid is same as s.sid and r.bid is same as b.bid and color is red
i think 2nd is also true.
so both are correct