Which is an example of how non-european cultures made the era of european exploration possible?
european explorers relied on african, asian, and native american sailors to crew their ships.
european explorers used non-european inventions such as the astrolabe, the compass, and gunpowder
asian diplomats initially invited and welcomed european trading expeditions to their lands.
asian eagemess for knowledge of christianity gave europeans an excuse for commercial exploration

European explorers used non-European inventions such as the astrolabe, the compass, and gunpowder.

Explanation:

The other three answers are simply false. There was no interest from Asian cultures to invite trade or religious exchange. Africans and Native American were seldom used as crew on the ships.

It was the technological influence what made a difference. This is an interesting topic because it was Europeans who took advantage of those inventions.  

There are theories that try to explain why didn't the Asian, and particularly the Chinese, used those inventions to explore the Pacific.  

One such theory says that Europeans had a bigger need for expansion outwards, while the Chinese could focus on an internal expansion.  

(B)  European explorers used non-European inventions such as the astrolabe, the compass, and gunpowder.

Explanation:

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tearing down the berlin wall.