A theory is a set of related hypotheses that have been tested and confirmed many times by many scientists. Which of the following could cause a long-held theory to be challenged or even overturned by the scientific community? (SC.912.N.1.1)

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1 point
a. new evidence that better matches the new theory than previous evidence
b. a popular celebrity who disagrees with the ideas outlined in the old theory
c. a scientist who has strong beliefs that the old theory is wrong but little evidence
d. a group of scientists who believe that new theories are usually better than old theories

a. new evidence that better matches the new theory than previous evidence