Answer:
![\boxed {\boxed {\sf B. \ Europeans \ gained \ advanced \ technology}}](https://img.qammunity.org/2021/formulas/history/high-school/f2qm80umei490a7khj62vwaxyuwwvxx4x5.png)
Step-by-step explanation:
Columbus's voyages opened up the Western hemisphere of the world to Europe. The Old world (Europe) was now aware of the New World (The Americas).
When news of his voyages spread, rumors about gold and silver in this New World spread fast. The monarchy wanted to gain power/territory and strengthen the economy. Individual explorers hoped to get rich and famous, while others also wanted to get more religious support.
Further exploration occurred, as well as more Spanish colonization in the Americas.
The Colombian Exchange allowed for food, animals, diseases, and people to be spread and exchanged, but advanced technology wasn't really gained by the Europeans.
Therefore, the best answer for: Which is not an effect of Columbus's voyages is B. Europeans gained advanced technology.