Answer:
B. All evidence is not equal in quality
Explanation:
The scenario that is being described in the question highlights the critical thinking principle that all evidence is not equal in quality. Just because the evidence is said to exist does not mean that it is of high quality or even of any value at all. Such as in this case, the scientists claimed that they had evidence of "cold fusion" but that evidence was useless due to their sloppy methods of recording all of their tests/findings.