Which three of the following technological advances allowed european sailors to find routes to asia?

Compass, Astrolabe and Caravel (New Ships).

Explanation:

It was in the Age of exploration era in 1400 and 1500 when European explorers were sailing and exploring the routes to find new lands and wealth. It was also the period when technological advancement was taking place for the better voyages in the rough seas and oceans. The explorers were able to make discoveries with the help of compass which showed the magnetic poles of the earth to find north and south, astrolabe which showed altitude above the horizon of a celestial body, and the caravel, light and small Portuguese ships which helped explorers to sail fast.

im not sure on this one

b europeans take corn to africa. corn becomes an important crop there.