Answer:
B. Scientists decided that they need to test out their ideas.
Explanation:
There are so many religions out in the world, and a scientist can't rely on a religion for scientific work. Religions are basically beliefs of a higher power, meant to help you in life, and guide you. But science is more than that because there's proof.
Religions are basically started by other human beings, and this world wasn't built or created by a human being. I don't wanna offend people's religion, I'm just saying Science is a whole 'nother topic.