What was main reason columbus sailed to the americas?

1. he wanted to find riches.
2. he wanted to prove that the world was round.
3. he wanted to prove his seamanship.
4. he wanted to see india.

I apologize, the answer is A or 1. He wanted to find riches

He was looking for a shorter route to Asia because of the spices, gold, and pearls, but found the Americas, so he was calling the then Native Americans, Indians.