The scientists who have contributed to our current body of knowledge were from "All areas of the world".
Answer: Option B
Explanation:
Scientist have played great role in scheduling human life comparatively easier on the Earth, which took their huge calories and mental capacity to invent or discover for mankind. Firstly it was very difficult to find the sources, soonafter achieving this milestone curiosity and need got increased for the better path of acquiring it. These two things automatically suggests that how easy it became now in many cases to have both.
The life changing scientists are like: