Answer :
Karl Popper, a 20th-century philosopher, claimed that genuine scientific theories are falsifiable. Thus, the correct option is A). falsifiable.
What is Karl Popper's theory?
Karl Popper proposed the Falsification Principle in which he boundaries the science from the non-science. He criticizes the theories established by science and opposes the logical positivism. He suggested that any theory before considered as scientific theory, need to tested.
He believed that social science could be scientific but the social scientific knowledge must have to be based on deduction and falsification. In his Logic of Scientific Research he proposed a test criterion that he named falsifiability to determine the scientific validity.
He is best known for his 1945 book "The Open Society and Its Enemies" which is pure scientific philosophy.
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