Which piece of evidence justifies the sharing of information to form a scientific theory?

A Scientists studying radiation with telescopes believed that pigeon droppings may have skewed their results.

B One group of scientists had data showing widespread microwave radiation that theorists at another institution needed.

C Multiple groups of scientists met at a conference to discuss the theory of continental drift.

D The theory that continents are embedded in floating plates explains how hippopotamuses once lived on Madagascar.