What forced Europeans to look for other routes east? Land routes were closed off by Ottoman Turks. Europeans were conquered by Ottoman Turks. Europeans lost interest in Eastern products. Land routes no longer led to needed goods.

From that list, what forced European to look for other routes east was the fact that A. land routes were closed off by Ottoman Turks. Controlling the land routes gave a great deal of economic and political power to the Ottoman Turks and thus Europeans took to the sea in effort to bypass those routes and find other ways to trade with Eastern powers.