The action would most likely lead scientists to change or improve an existing scientific theory is :
Gathering new evidence using new technologies or procedures
Option c is the correct answer.
This is so simply because when a new evidence is discovered, tested and proven to be positively true, a change in scientific therefore becomes a necessity.
Scientific theory can simply be defined as those testable and make falsifiable predictions.
However, they usually and frequently describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe.
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