Which of these is considered the primary motivation for countries like spain and portugal to begin seaborne exploration in the
late-1400s?

finding less-expensive trade routes

hope this ! x

Due to single producer of iodine.

Explanation:

The unique thing about Oklahoma's production of iodine is that it produces is the single producer of iodine in the whole country. the iodine produced by the Oklahoma comes from the deposits of iodine present inside the earth on a large area. so that's why Oklahoma is the only producer of iodine in the whole country and enough for its uniqueness.