Answer:
B. Scientific knowledge usually grows slowly through contributions from many different investigators from diverse cultures.
Explanation:
In science, to be valid a new knowledge, need to be certified by many researches, in different parts of our world by the same conditions, this is what it is called replication.
When a phenomena can be done several times under the same conditions with similar results, then it is consider like a real knowledge and not just lucky or the point of view from one person.
In science to consider replicated some results, the sadistic is helpful by the close relation among results.