The most accurate response regarding the impact of the 1985 Schengen Treaty on migration flows in Europe is:
The treaty made migration among European countries more open, and many moved seeking economic opportunity.
The Schengen Agreement facilitated the free movement of people across member countries, thereby increasing mobility within Europe and allowing individuals to pursue economic opportunities more easily. The treaty aimed to create a borderless area which would streamline travel and trade, ultimately influencing migration patterns within Europe.